{"product_id":"iwc-portugieser-eternal-calendar-white-iw505701-2025","title":"IWC - Portugieser Eternal Calendar – White – IW505701 – 2025","description":"\u003cp\u003e\u003cspan\u003eThe IWC Portugieser Eternal Calendar reference IW505701 represents one of the most technically advanced calendar watches ever produced by IWC Schaffhausen. Introduced in 2024 and presented here as a 2025 example, it houses IWC’s first secular perpetual calendar within a 44.4mm platinum case. Its white glass dial, slender appliqués and railway-track minute scale preserve the clean visual language of the Portugieser despite the complexity of its calendar displays.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA conventional perpetual calendar assumes that every year divisible by four is a leap year and therefore requires manual correction in secular years such as 2100, 2200 and 2300. The Eternal Calendar solves this limitation with a newly developed 400-year gear. Completing one rotation every four centuries, the mechanism automatically skips three leap years and accounts for the Gregorian calendar’s exception rules. Provided the watch remains running, its calendar is mechanically programmed to remain accurate through the year 3999.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe dial displays the date, day, month, four-digit year, power reserve and moon phase. IWC’s Double Moon indication depicts the moon as viewed from both the Northern and Southern Hemispheres. Its specially calculated reduction gear was developed after analyzing more than 22 trillion gear combinations and will theoretically deviate from the moon’s actual orbit by only one day after 45 million years.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePowering the watch is the automatic IWC manufacture calibre 52640. Its Pellaton winding system builds approximately seven days of power reserve across two mainspring barrels. All calendar displays are synchronized and can be advanced together through the crown, preserving the intuitive operating system developed for IWC’s earlier perpetual calendars. The movement is visible through the sapphire caseback, revealing its decorated bridges and rotor with an 18-carat gold medallion.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Portugieser Eternal Calendar received the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAiguille d’Or\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e at the 2024 Grand Prix d’Horlogerie de Genève, the competition’s highest distinction. It was also recognized by Guinness World Records for the extraordinary calculated precision of its moon-phase display.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eBrand:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e IWC Schaffhausen\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCollection:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Portugieser\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eModel:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Eternal Calendar\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eReference:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e IW505701\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eYear:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2025\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eIntroduced:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2024\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCase:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Platinum\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCase Diameter:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 44.4mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCase Thickness:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 14.9mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eDial:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e White glass\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCrystal:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Double box-glass sapphire with anti-reflective coating on both sides\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCaseback:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Sapphire exhibition caseback\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMovement:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e IWC manufacture calibre 52640\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWinding:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Mechanical and self-winding\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWinding System:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Pellaton automatic winding\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003ePower Reserve:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Approximately 168 hours or seven days\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFrequency:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 28,800 vibrations per hour\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eJewels:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 54\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eComponents:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 396\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRotor:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Decorated rotor with an 18-carat gold medallion\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCalendar Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Secular perpetual calendar\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCalendar Programming:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Accounts for Gregorian leap-year exceptions through the year 3999\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMoon Phase:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Double Moon display for the Northern and Southern Hemispheres\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMoon-Phase Accuracy:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Theoretical deviation of one day after approximately 45 million years\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWater Resistance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 50 meters\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eStrap:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Black Santoni alligator leather\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eStrap Width:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 22mm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFunctions:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Hours, minutes, small hacking seconds, date, day, month, four-digit year, power-reserve indication and eternal moon phase\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSpecial Features:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Eight-part 400-year calendar module, crown-controlled synchronized calendar, twin mainspring barrels and double-sided moon-phase display\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAward:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2024 GPHG Aiguille d’Or\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Investment Watches Inc","offers":[{"title":"Default Title","offer_id":57583908127046,"sku":"A2457","price":114750.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0630\/5559\/3658\/files\/IMG_5136_a86bfbba-0a5c-4515-910a-3c061a7da910.png?v=1792014524","url":"https:\/\/www.investmentwatches.com\/products\/iwc-portugieser-eternal-calendar-white-iw505701-2025","provider":"Investment Watches Inc","version":"1.0","type":"link"}