{"product_id":"patek-philippe-annual-calendar-chronograph-5905-1a-001","title":"Patek Philippe Annual Calendar Chronograph 5905\/1A-001","description":"\u003cp\u003ePatek Philippe patented the annual calendar in 1996, and in doing so created a complication that had not previously existed. A perpetual calendar accounts for leap years through a mechanism of considerable complexity; a simple calendar needs correcting five times a year. The annual calendar sits between them, requiring a single adjustment each March, and it has become one of the few genuinely new complications of the modern era.\u003c\/p\u003e\n\u003cp\u003eThe 5905\/1A-001 pairs that calendar with a flyback chronograph in a 42mm steel case, and the \u003cem\u003e\/1A\u003c\/em\u003e in the reference denotes the integrated steel bracelet. The green sunburst dial is free of applied numerals, with day, date and month shown through three apertures beneath twelve and a single subdial at six o'clock. Patek introduced this green execution in 2021.\u003c\/p\u003e\n\u003cp\u003eInside is Calibre CH 28-520 QA 24H, a self-winding column-wheel chronograph with vertical clutch, carrying the annual calendar module and a fifty-five hour power reserve. Water resistance is 3 ATM, appropriate to a watch of this complication rather than a tool piece.\u003c\/p\u003e\n\u003cp\u003eThe integrated bracelet was designed for this case and cannot be substituted, which places the 5905\/1A in a small group of Patek references offered on steel rather than leather.\u003c\/p\u003e\n\u003cp\u003eThis example is offered as a full set in very good condition, and, like every watch Uptown Exchange lists, has been authenticated and inspected before being offered for sale.\u003c\/p\u003e","brand":"Patek Philippe","offers":[{"title":"Default Title","offer_id":50562713026630,"sku":"5905\/1A-001","price":45900.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0752\/7255\/2518\/files\/rbm7t0luktwj-0zzqjc5605vt6hdq19jj9oe1-ExtraLarge.jpg?v=1793352648","url":"https:\/\/uptownexchange.co\/products\/patek-philippe-annual-calendar-chronograph-5905-1a-001","provider":"Uptown Exchange","version":"1.0","type":"link"}