Patek Philippe Annual Calendar Chronograph 5905/1A-001
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Patek Philippe Annual Calendar Chronograph 5905/1A-001
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Patek 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.
The 5905/1A-001 pairs that calendar with a flyback chronograph in a 42mm steel case, and the /1A 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.
Inside 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.
The 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.
This 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.
Authenticated
Full Set Documented
Insured Shipping
7-Day Return Window
Condition Report
Full condition report available upon request — contact our team for complete details on this piece.
Specs
BrandPatek Philippe
Shipping & Returns
Every watch listed by Uptown Exchange is independently authenticated and inspected before it goes up for sale, and ships fully insured with signature confirmation required on delivery. We ship via major carriers in discreet, unbranded packaging, and you'll receive tracking information as soon as your order leaves our hands.
Each piece is backed by a 7-day return window from the date of delivery. If a watch isn't right for you, contact our team within 7 days to arrange a return; the item must come back in the same condition it was sent, with all original packaging, box, and papers included if it shipped with them. Return shipping is insured the same way outbound shipping is.
Because every listing is a single, individually inspected piece, we recommend reaching out with any questions on fit, condition, or authenticity before you buy — we're glad to send additional photos or answer specifics on a piece before you commit.
