{"lien_WSTV":"","tax_name":"deprecated","tax_rate":20,"id_manufacturer":"0","id_supplier":"0","id_category_default":"545","id_shop_default":"1","manufacturer_name":false,"supplier_name":false,"name":"IWC Portugieser Eternal Calendar","description":"<p><strong>THE IWC SCHAFFHAUSEN PORTUGIESER ETERNAL CALENDAR WITH MOON PHASE ACCURACY OF 45 MILLION YEARS<\/strong><\/p>\n<p>Schaffhausen\/Geneva, 9th April 2024: IWC Schaffhausen introduces the Portugieser Eternal Calendar at Watches and Wonders Geneva. Drawing on the extensive calendar expertise it has acquired since introducing the perpetual calendar almost four decades ago, IWC now pushes the boundaries once again with its first secular perpetual calendar. In addition to recognising the different lengths of the months and adding a leap day every four years, the Portugieser Eternal Calendar also takes into account the Gregorian calendar\u2019s complex leap-year exception rules. A newly engineered 400-years gear ensures that the calendar automatically skips three leap years over four centuries \u2013 an event which will occur for the first time in the year 2100. Another key feature of this watch is the extremely precise moon phase display. Thanks to a newly developed reduction gear, the Double Moon\u2122 phase display will only deviate from the moon\u2019s orbit by one day after 45 million years. The Portugieser Eternal Calendar features an intricately finished platinum case and a black alligator leather strap from Santoni. The extensive use of glass elements such as a glass dial and double box-glass sapphire crystals showcases the ingenious mechanism inside. The increased transparency also creates a unique sense of lightness, airiness and understated elegance.<\/p>\n<p>Translating the irregular calendar into a mechanical program for a wristwatch remains one of the most challenging engineering feats in fine watchmaking. The Gregorian calendar, which is used across most continents and cultures today, divides the year into twelve months with 28, 30 or 31 days. Years that are divisible by four count as leap years, meaning that a 29th day must be added at the end of February. However, an additional correction is needed to keep the calendar in sync with the actual solar year: only those centurial years that can be divided by 400 are leap years, all others are common years. This means that 2000 and 2400 are leap years, while 2100, 2200 and 2300, for example, are common years. A traditional perpetual calendar, however, is only programmed for a four-year cycle, in which three common years are always followed by a leap year. By design, it will interpret the year 2100 as a leap year and need a correction. The same will happen again in 2200 and 2300. As a result, a perpetual calendar will need three corrections over a period of 400 years. A secular perpetual calendar like the Portugieser Eternal Calendar (Ref. IW505701), on the other hand, is mechanically programmed to take these complex nuances into account. It will calculate the leap year correctly until at least the year 3999, as it has not yet been officially decided whether the year 4000 will be a leap year or not.<\/p>\n<p>\u201cSince Kurt Klaus developed his legendary perpetual calendar in the 1980s, IWC Schaffhausen has accumulated unique expertise in mechanical calendars that are ingeniously efficient in their design and easy to use.<\/p>\n<p>With the new Portugieser Eternal Calendar, we now venture further than ever before, touching the limits of eternity. Our first secular perpetual calendar automatically takes into account the Gregorian calendar\u2019s complex leap-year exception rules by skipping the leap year three times over 400 years. True to the spirit of engineers who are always pushing the boundaries, we have also fitted this technical marvel with a moon phase display that will only deviate from the moon\u2019s orbit by one day after 45 million years,\u201d explains Chris Grainger-Herr, CEO of IWC Schaffhausen.<\/p>\n<p><strong>THE 400-YEARS GEAR SKIPS THREE LEAP YEARS IN FOUR CENTURIES<\/strong><\/p>\n<p>The Portugieser Eternal Calendar is based on the same modular and synchronised design as the existing perpetual calendar. All its displays can be advanced using the crown. However, while the perpetual calendar is programmed for a four-year cycle, the Portugieser Eternal Calendar features an additional mechanism. Every four years at the end of February, a new module informs the calendar about whether the leap year takes place or not. This so-called 400-years gear completes only one revolution every four centuries. It contains three indentations, which cause the calendar to skip three leap years over that period. This module is designed with impressive efficiency and technical elegance and consists of only eight parts, underscoring IWC Schaffhausen\u2019s engineering approach to fine watchmaking.<\/p>\n<p><strong>MOON PHASE WITH A CALCULATED ACCURACY OF 45 MILLION YEARS<\/strong><\/p>\n<p>Since the introduction of the perpetual calendar almost four decades ago, IWC has also taken great strides to continuously improve the accuracy of its moon phase displays. While the Da Vinci Perpetual Calendar Chronograph (Ref. IW3750) from 1985 featured a moon phase precision of 122 years, the first Portugieser Perpetual Calendar (Ref. IW5021) from 2003 impressed with a moon phase accuracy of 577.5 years. IWC\u2019s engineers have now taken on the challenge to develop a new moon phase display with unprecedented precision.<\/p>\n<p>The difficulty in displaying the moon phase on the dial of a watch lies in the fact that the moon does not follow a daily rhythm in its orbit around the Earth. A cycle from new moon to new moon \u2013 one lunation \u2013 does not last 30 days, but rather 29 days, 12 hours, 44 minutes, and<\/p>\n<p>2.88 seconds. The duration of one calendar month must therefore be reduced as close as possible to one lunar cycle. This is achieved by placing a reduction gear between the base movement and the moon phase disc. The key to high precision lies in the quantity of wheels used, their proportions and the number of teeth they have. IWC\u2019s engineers have now used a special computer program to simulate more than 22 trillion different combinations. For the Portugieser Eternal Calendar, they came up with a new reduction gear train using three intermediate wheels. Mathematically, the display will only deviate from the moon\u2019s orbit by one day after 45 million years. Another challenge consisted in integrating this new gear train into the confined space of the eternal calendar module.<\/p>\n<p>The moon phase is displayed on the dial using the characteristic Double Moon\u2122 indication, which shows the moon as seen from the Northern and Southern hemispheres. The display consists of two super- imposed discs. A celestial disc with two small circular openings rotates above an immobile lower disc with two dots. This negative representation gives the impression that two small moons are waxing or waning. Here, the lower disc is made of titanium and decorated with a Guilloch\u00e9 pattern. The upper disc is made of glass.<\/p>\n<p><strong>INTRICATELY CRAFTED GLASS DIAL AND DOUBLE BOX-GLASS<\/strong><\/p>\n<p>The Portugieser Eternal Calendar features an intricately finished platinum case with polished and brushed surfaces. Another highlight is the glass dial, which is manufactured in a complex process. In the first step, the underside of the dial is frosted and lacquered in white. The subdials are machined and polished separately and subsequently fixed onto the dial. In the next step, the printing is applied, and the appliques are mounted by hand. The depth of the glass lends the print and appliques a floaty lightness. The numerals and the characteristic Portugieser minute scale are printed on a white lacquered flange sitting between the glass dial and the front glass. The box-glass sapphire crystals are machined and polished in an elaborate process. The Portugieser Eternal Calendar is fitted with a black alligator leather strap from the Italian leather artisan Santoni with a platinum folding clasp.<\/p>\n<p><strong>IWC-MAN UFACTURED 52640 CALIBRE WITH SEVEN DAY POWER RESERVE<\/strong><\/p>\n<p>At work inside the platinum case is the newly developed IWC-manufactured 52640 calibre. The high-end calibre features a highly efficient Pellaton winding system. Using movements of the rotor in both directions, it reliably builds up a power reserve of seven days (168 hours) in the two barrels. Parts of the winding system that are subject to extremely high stresses are manufactured using virtually wear-free zirconium oxide ceramic. The movement has been elaborately finished with circular graining and Geneva stripes and can be admired through the box-shaped sapphire glass case back.<\/p>\n<p><\/p>","description_short":"","quantity":0,"minimal_quantity":"0","available_now":"","available_later":"","price":0,"specificPrice":false,"additional_shipping_cost":"0.00","wholesale_price":"0.000000","on_sale":"0","online_only":"0","unity":"","unit_price":0,"unit_price_ratio":"0.000000","ecotax":"0.000000","reference":"IW505701","supplier_reference":"","location":"","width":"0.000000","height":"0.000000","depth":"0.000000","weight":"0.000000","ean13":"","upc":"","link_rewrite":"iwc-portugieser-eternal-calendar","meta_description":"THE IWC SCHAFFHAUSEN PORTUGIESER ETERNAL CALENDAR WITH MOON PHASE ACCURACY OF 45 MILLION YEARS Schaffhausen\/Geneva, 9th April 2024: IWC Schaffhausen introduc...","meta_keywords":"","meta_title":"Watch IWC IWC Portugieser Eternal Calendar | Portuguese IW505701 Platinum - White Dial - Strap Alligator","quantity_discount":"0","customizable":"0","new":false,"uploadable_files":"0","text_fields":"0","active":"1","redirect_type":"","id_product_redirected":"0","available_for_order":"0","available_date":"0000-00-00","condition":"new","show_price":"1","indexed":"0","visibility":"both","date_add":"2024-08-20 17:01:03","date_upd":"2024-08-22 13:23:23","tags":false,"base_price":"0.000000","id_tax_rules_group":"1","id_color_default":0,"advanced_stock_management":"0","out_of_stock":2,"depends_on_stock":false,"isFullyLoaded":true,"cache_is_pack":"0","cache_has_attachments":"1","is_virtual":"0","id_pack_product_attribute":null,"cache_default_attribute":"0","category":"portugaise","pack_stock_type":"0","id":9016,"id_shop_list":null,"force_id":false,"customization_required":false}
{"Compl\u00e9ment":"Platinum - White Dial - Strap Alligator ","Statut de vente":"En vente depuis","Date":"2024","Sexe":"Homme","Diam\u00e8tre":"44.4","Epaisseur":"15","Types":"Self-winding","Styles":"High Horology","Calibre_autre":"52640","Affichage_autre":"Rhodium-plated hands and appliques","Complication":"Secular perpetual calendar with displays for the date; day; month; year in four digits \u2013\r\nPerpetual moon phase with 45.000.000 years accuracy for both northern and southern hemispheres \u2013\r\n400-years gear for the recognition of irregular leap years \u2013 Small hacking seconds ","Mati\u00e8re du bo\u00eetier":"Platinum","Particularit\u00e9 du boitier":"Sapphire caseback, Transparent caseback","Etanch\u00e9it\u00e9":"50 meters","Forme":"Round","Cadran":"Glace","Couleur du cadran":"White","Verre":"Sapphire","Verre_autre":"Glassbox, Anti-reflective coating on both faces","Mati\u00e8re du bracelet":"Alligator leather","Fermeture du bracelet":"Folding buckle ","Couleur du bracelet":"Black","Plus de caract\u00e9ristiques":"<br\/>\r\nMovement<br\/>\r\nMechanical movement <br\/>\r\nPellaton automatic winding system <br\/>\r\nRotor in 18-carat gold <br\/>\r\nIWC-manufactured calibre\t52640<br\/>\r\nFrequency\t28,800 vph \/ 4 Hz<br\/>\r\nJewels\t54<br\/>\r\nPower reserve\t7 days (168 h)<br\/>\r\nWinding\tAutomatic<br\/>\r\n<br\/>\r\nCase<br\/>\r\nPlatinum <br\/>\r\n<br\/>\r\nDial<br\/>\r\nGlass dial with white lacquer<br\/>\r\n<br\/>\r\nStrap \/ Buckles<br\/>\r\nBlack alligator leather strap from Santoni with platinum folding clasp"}
IWC Portugieser Eternal Calendar
IW505701
| Brand : | IWC |
| Collection : | Portuguese |
| Model : | IWC Portugieser Eternal Calendar |
| Reference : | IW505701 |
| Complement : | Platinum - White Dial - Strap Alligator |
| On sale : | 2024 |
PDF INDEX CARD
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Brand : IWC Collection : Portuguese Model : IWC Portugieser Eternal Calendar Reference : IW505701 Complement : Platinum - White Dial - Strap Alligator On sale : 2024 List Price : On request Diameter : 44.4 mm Thickness : 15 mm Styles : High Horology Types : Self-winding Calibre : 52640 Complication : Secular perpetual calendar with displays for the date; day; month; year in four digits – Perpetual moon phase with 45.000.000 years accuracy for both northern and southern hemispheres – 400-years gear for the recognition of irregular leap years – Small hacking seconds Case material : Platinum Case peculiarity : Sapphire caseback Transparent caseback Shape : Round Water-resistance : 50 meters Dial : Glace Dial color : White Display : Rhodium-plated hands and appliques Glass : Sapphire Glassbox Anti-reflective coating on both faces Strap material : Alligator leather Strap color : Black Strap clasp : Folding buckle + More characteristics :
Movement
Mechanical movement
Pellaton automatic winding system
Rotor in 18-carat gold
IWC-manufactured calibre 52640
Frequency 28,800 vph / 4 Hz
Jewels 54
Power reserve 7 days (168 h)
Winding Automatic
Case
Platinum
Dial
Glass dial with white lacquer
Strap / Buckles
Black alligator leather strap from Santoni with platinum folding clasp
DESCRIPTION
THE IWC SCHAFFHAUSEN PORTUGIESER ETERNAL CALENDAR WITH MOON PHASE ACCURACY OF 45 MILLION YEARS
Schaffhausen/Geneva, 9th April 2024: IWC Schaffhausen introduces the Portugieser Eternal Calendar at Watches and Wonders Geneva. Drawing on the extensive calendar expertise it has acquired since introducing the perpetual calendar almost four decades ago, IWC now pushes the boundaries once again with its first secular perpetual calendar. In addition to recognising the different lengths of the months and adding a leap day every four years, the Portugieser Eternal Calendar also takes into account the Gregorian calendar’s complex leap-year exception rules. A newly engineered 400-years gear ensures that the calendar automatically skips three leap years over four centuries – an event which will occur for the first time in the year 2100. Another key feature of this watch is the extremely precise moon phase display. Thanks to a newly developed reduction gear, the Double Moon™ phase display will only deviate from the moon’s orbit by one day after 45 million years. The Portugieser Eternal Calendar features an intricately finished platinum case and a black alligator leather strap from Santoni. The extensive use of glass elements such as a glass dial and double box-glass sapphire crystals showcases the ingenious mechanism inside. The increased transparency also creates a unique sense of lightness, airiness and understated elegance.
Translating the irregular calendar into a mechanical program for a wristwatch remains one of the most challenging engineering feats in fine watchmaking. The Gregorian calendar, which is used across most continents and cultures today, divides the year into twelve months with 28, 30 or 31 days. Years that are divisible by four count as leap years, meaning that a 29th day must be added at the end of February. However, an additional correction is needed to keep the calendar in sync with the actual solar year: only those centurial years that can be divided by 400 are leap years, all others are common years. This means that 2000 and 2400 are leap years, while 2100, 2200 and 2300, for example, are common years. A traditional perpetual calendar, however, is only programmed for a four-year cycle, in which three common years are always followed by a leap year. By design, it will interpret the year 2100 as a leap year and need a correction. The same will happen again in 2200 and 2300. As a result, a perpetual calendar will need three corrections over a period of 400 years. A secular perpetual calendar like the Portugieser Eternal Calendar (Ref. IW505701), on the other hand, is mechanically programmed to take these complex nuances into account. It will calculate the leap year correctly until at least the year 3999, as it has not yet been officially decided whether the year 4000 will be a leap year or not.
“Since Kurt Klaus developed his legendary perpetual calendar in the 1980s, IWC Schaffhausen has accumulated unique expertise in mechanical calendars that are ingeniously efficient in their design and easy to use.
With the new Portugieser Eternal Calendar, we now venture further than ever before, touching the limits of eternity. Our first secular perpetual calendar automatically takes into account the Gregorian calendar’s complex leap-year exception rules by skipping the leap year three times over 400 years. True to the spirit of engineers who are always pushing the boundaries, we have also fitted this technical marvel with a moon phase display that will only deviate from the moon’s orbit by one day after 45 million years,” explains Chris Grainger-Herr, CEO of IWC Schaffhausen.
THE 400-YEARS GEAR SKIPS THREE LEAP YEARS IN FOUR CENTURIES
The Portugieser Eternal Calendar is based on the same modular and synchronised design as the existing perpetual calendar. All its displays can be advanced using the crown. However, while the perpetual calendar is programmed for a four-year cycle, the Portugieser Eternal Calendar features an additional mechanism. Every four years at the end of February, a new module informs the calendar about whether the leap year takes place or not. This so-called 400-years gear completes only one revolution every four centuries. It contains three indentations, which cause the calendar to skip three leap years over that period. This module is designed with impressive efficiency and technical elegance and consists of only eight parts, underscoring IWC Schaffhausen’s engineering approach to fine watchmaking.
MOON PHASE WITH A CALCULATED ACCURACY OF 45 MILLION YEARS
Since the introduction of the perpetual calendar almost four decades ago, IWC has also taken great strides to continuously improve the accuracy of its moon phase displays. While the Da Vinci Perpetual Calendar Chronograph (Ref. IW3750) from 1985 featured a moon phase precision of 122 years, the first Portugieser Perpetual Calendar (Ref. IW5021) from 2003 impressed with a moon phase accuracy of 577.5 years. IWC’s engineers have now taken on the challenge to develop a new moon phase display with unprecedented precision.
The difficulty in displaying the moon phase on the dial of a watch lies in the fact that the moon does not follow a daily rhythm in its orbit around the Earth. A cycle from new moon to new moon – one lunation – does not last 30 days, but rather 29 days, 12 hours, 44 minutes, and
2.88 seconds. The duration of one calendar month must therefore be reduced as close as possible to one lunar cycle. This is achieved by placing a reduction gear between the base movement and the moon phase disc. The key to high precision lies in the quantity of wheels used, their proportions and the number of teeth they have. IWC’s engineers have now used a special computer program to simulate more than 22 trillion different combinations. For the Portugieser Eternal Calendar, they came up with a new reduction gear train using three intermediate wheels. Mathematically, the display will only deviate from the moon’s orbit by one day after 45 million years. Another challenge consisted in integrating this new gear train into the confined space of the eternal calendar module.
The moon phase is displayed on the dial using the characteristic Double Moon™ indication, which shows the moon as seen from the Northern and Southern hemispheres. The display consists of two super- imposed discs. A celestial disc with two small circular openings rotates above an immobile lower disc with two dots. This negative representation gives the impression that two small moons are waxing or waning. Here, the lower disc is made of titanium and decorated with a Guilloché pattern. The upper disc is made of glass.
INTRICATELY CRAFTED GLASS DIAL AND DOUBLE BOX-GLASS
The Portugieser Eternal Calendar features an intricately finished platinum case with polished and brushed surfaces. Another highlight is the glass dial, which is manufactured in a complex process. In the first step, the underside of the dial is frosted and lacquered in white. The subdials are machined and polished separately and subsequently fixed onto the dial. In the next step, the printing is applied, and the appliques are mounted by hand. The depth of the glass lends the print and appliques a floaty lightness. The numerals and the characteristic Portugieser minute scale are printed on a white lacquered flange sitting between the glass dial and the front glass. The box-glass sapphire crystals are machined and polished in an elaborate process. The Portugieser Eternal Calendar is fitted with a black alligator leather strap from the Italian leather artisan Santoni with a platinum folding clasp.
IWC-MAN UFACTURED 52640 CALIBRE WITH SEVEN DAY POWER RESERVE
At work inside the platinum case is the newly developed IWC-manufactured 52640 calibre. The high-end calibre features a highly efficient Pellaton winding system. Using movements of the rotor in both directions, it reliably builds up a power reserve of seven days (168 hours) in the two barrels. Parts of the winding system that are subject to extremely high stresses are manufactured using virtually wear-free zirconium oxide ceramic. The movement has been elaborately finished with circular graining and Geneva stripes and can be admired through the box-shaped sapphire glass case back.
THE IWC SCHAFFHAUSEN PORTUGIESER ETERNAL CALENDAR WITH MOON PHASE ACCURACY OF 45 MILLION YEARS
Schaffhausen/Geneva, 9th April 2024: IWC Schaffhausen introduces the Portugieser Eternal Calendar at Watches and Wonders Geneva. Drawing on the extensive calendar expertise it has acquired since introducing the perpetual calendar almost four decades ago, IWC now pushes the boundaries once again with its first secular perpetual calendar. In addition to recognising the different lengths of the months and adding a leap day every four years, the Portugieser Eternal Calendar also takes into account the Gregorian calendar’s complex leap-year exception rules. A newly engineered 400-years gear ensures that the calendar automatically skips three leap years over four centuries – an event which will occur for the first time in the year 2100. Another key feature of this watch is the extremely precise moon phase display. Thanks to a newly developed reduction gear, the Double Moon™ phase display will only deviate from the moon’s orbit by one day after 45 million years. The Portugieser Eternal Calendar features an intricately finished platinum case and a black alligator leather strap from Santoni. The extensive use of glass elements such as a glass dial and double box-glass sapphire crystals showcases the ingenious mechanism inside. The increased transparency also creates a unique sense of lightness, airiness and understated elegance.
Translating the irregular calendar into a mechanical program for a wristwatch remains one of the most challenging engineering feats in fine watchmaking. The Gregorian calendar, which is used across most continents and cultures today, divides the year into twelve months with 28, 30 or 31 days. Years that are divisible by four count as leap years, meaning that a 29th day must be added at the end of February. However, an additional correction is needed to keep the calendar in sync with the actual solar year: only those centurial years that can be divided by 400 are leap years, all others are common years. This means that 2000 and 2400 are leap years, while 2100, 2200 and 2300, for example, are common years. A traditional perpetual calendar, however, is only programmed for a four-year cycle, in which three common years are always followed by a leap year. By design, it will interpret the year 2100 as a leap year and need a correction. The same will happen again in 2200 and 2300. As a result, a perpetual calendar will need three corrections over a period of 400 years. A secular perpetual calendar like the Portugieser Eternal Calendar (Ref. IW505701), on the other hand, is mechanically programmed to take these complex nuances into account. It will calculate the leap year correctly until at least the year 3999, as it has not yet been officially decided whether the year 4000 will be a leap year or not.
“Since Kurt Klaus developed his legendary perpetual calendar in the 1980s, IWC Schaffhausen has accumulated unique expertise in mechanical calendars that are ingeniously efficient in their design and easy to use.
With the new Portugieser Eternal Calendar, we now venture further than ever before, touching the limits of eternity. Our first secular perpetual calendar automatically takes into account the Gregorian calendar’s complex leap-year exception rules by skipping the leap year three times over 400 years. True to the spirit of engineers who are always pushing the boundaries, we have also fitted this technical marvel with a moon phase display that will only deviate from the moon’s orbit by one day after 45 million years,” explains Chris Grainger-Herr, CEO of IWC Schaffhausen.
THE 400-YEARS GEAR SKIPS THREE LEAP YEARS IN FOUR CENTURIES
The Portugieser Eternal Calendar is based on the same modular and synchronised design as the existing perpetual calendar. All its displays can be advanced using the crown. However, while the perpetual calendar is programmed for a four-year cycle, the Portugieser Eternal Calendar features an additional mechanism. Every four years at the end of February, a new module informs the calendar about whether the leap year takes place or not. This so-called 400-years gear completes only one revolution every four centuries. It contains three indentations, which cause the calendar to skip three leap years over that period. This module is designed with impressive efficiency and technical elegance and consists of only eight parts, underscoring IWC Schaffhausen’s engineering approach to fine watchmaking.
MOON PHASE WITH A CALCULATED ACCURACY OF 45 MILLION YEARS
Since the introduction of the perpetual calendar almost four decades ago, IWC has also taken great strides to continuously improve the accuracy of its moon phase displays. While the Da Vinci Perpetual Calendar Chronograph (Ref. IW3750) from 1985 featured a moon phase precision of 122 years, the first Portugieser Perpetual Calendar (Ref. IW5021) from 2003 impressed with a moon phase accuracy of 577.5 years. IWC’s engineers have now taken on the challenge to develop a new moon phase display with unprecedented precision.
The difficulty in displaying the moon phase on the dial of a watch lies in the fact that the moon does not follow a daily rhythm in its orbit around the Earth. A cycle from new moon to new moon – one lunation – does not last 30 days, but rather 29 days, 12 hours, 44 minutes, and
2.88 seconds. The duration of one calendar month must therefore be reduced as close as possible to one lunar cycle. This is achieved by placing a reduction gear between the base movement and the moon phase disc. The key to high precision lies in the quantity of wheels used, their proportions and the number of teeth they have. IWC’s engineers have now used a special computer program to simulate more than 22 trillion different combinations. For the Portugieser Eternal Calendar, they came up with a new reduction gear train using three intermediate wheels. Mathematically, the display will only deviate from the moon’s orbit by one day after 45 million years. Another challenge consisted in integrating this new gear train into the confined space of the eternal calendar module.
The moon phase is displayed on the dial using the characteristic Double Moon™ indication, which shows the moon as seen from the Northern and Southern hemispheres. The display consists of two super- imposed discs. A celestial disc with two small circular openings rotates above an immobile lower disc with two dots. This negative representation gives the impression that two small moons are waxing or waning. Here, the lower disc is made of titanium and decorated with a Guilloché pattern. The upper disc is made of glass.
INTRICATELY CRAFTED GLASS DIAL AND DOUBLE BOX-GLASS
The Portugieser Eternal Calendar features an intricately finished platinum case with polished and brushed surfaces. Another highlight is the glass dial, which is manufactured in a complex process. In the first step, the underside of the dial is frosted and lacquered in white. The subdials are machined and polished separately and subsequently fixed onto the dial. In the next step, the printing is applied, and the appliques are mounted by hand. The depth of the glass lends the print and appliques a floaty lightness. The numerals and the characteristic Portugieser minute scale are printed on a white lacquered flange sitting between the glass dial and the front glass. The box-glass sapphire crystals are machined and polished in an elaborate process. The Portugieser Eternal Calendar is fitted with a black alligator leather strap from the Italian leather artisan Santoni with a platinum folding clasp.
IWC-MAN UFACTURED 52640 CALIBRE WITH SEVEN DAY POWER RESERVE
At work inside the platinum case is the newly developed IWC-manufactured 52640 calibre. The high-end calibre features a highly efficient Pellaton winding system. Using movements of the rotor in both directions, it reliably builds up a power reserve of seven days (168 hours) in the two barrels. Parts of the winding system that are subject to extremely high stresses are manufactured using virtually wear-free zirconium oxide ceramic. The movement has been elaborately finished with circular graining and Geneva stripes and can be admired through the box-shaped sapphire glass case back.
-
Brand : IWC Collection : Portuguese Model : IWC Portugieser Eternal Calendar Reference : IW505701 Complement : Platinum - White Dial - Strap Alligator On sale : 2024 List Price : On request Diameter : 44.4 mm Thickness : 15 mm Styles : High Horology Types : Self-winding Calibre : 52640 Complication : Secular perpetual calendar with displays for the date; day; month; year in four digits – Perpetual moon phase with 45.000.000 years accuracy for both northern and southern hemispheres – 400-years gear for the recognition of irregular leap years – Small hacking seconds Case material : Platinum Case peculiarity : Sapphire caseback Transparent caseback Shape : Round Water-resistance : 50 meters Dial : Glace Dial color : White Display : Rhodium-plated hands and appliques Glass : Sapphire Glassbox Anti-reflective coating on both faces Strap material : Alligator leather Strap color : Black Strap clasp : Folding buckle More characteristics :
Movement
Mechanical movement
Pellaton automatic winding system
Rotor in 18-carat gold
IWC-manufactured calibre 52640
Frequency 28,800 vph / 4 Hz
Jewels 54
Power reserve 7 days (168 h)
Winding Automatic
Case
Platinum
Dial
Glass dial with white lacquer
Strap / Buckles
Black alligator leather strap from Santoni with platinum folding clasp