Patek Philippe Annual Calendar Reference 5205R-010（watch only）

**Patek Philippe Annual Calendar Reference 5205R-010**

This is a pre-owned, watch-only listing (no box or papers) for a Patek Philippe reference 5205R-010. The 5205 model was first introduced in 2010 in white gold, with the rose gold versions, including this black-dial variant, appearing in 2013 . It is part of Patek Philippe's Complications collection and is distinguished by its contemporary case architecture featuring a concave bezel, hollowed flanks, and skeletonized lugs, all hand-polished .

**Case & Dial**
The watch features a round case measuring 40 mm in diameter and approximately 11.36 mm in thickness . It is crafted from 18k rose gold and is fitted with a sapphire crystal display back . The dial is black with a lacquered finish and applied gold baton hour markers . The annual calendar display is arranged along the upper arc of the dial, with three apertures showing the day, date, and month; the date aperture at 12 o'clock is framed in rose gold to emphasize its importance . A moon phase aperture and a 24-hour indication are located in the lower half of the dial . The watch is water-resistant to 30 meters .

**Movement & Functions**
Powering the watch is Patek Philippe caliber 324 S QA LU 24H/303, a self-winding automatic movement . It beats at 28,800 vibrations per hour (4 Hz), contains 34 jewels, and offers a power reserve of approximately 45 hours . The movement carries the Patek Philippe Seal . The annual calendar mechanism is patented and requires only one manual adjustment per year, at the end of February . Functions include hours, minutes, central seconds, day, date, month, moon phase, and 24-hour indication .

**Condition & Accessories**
As a watch-only offering, this piece is sold without its original presentation box or papers. The listing indicates the watch is pre-owned and may show signs of wear consistent with normal use. It is fitted with a black alligator leather strap and an 18k rose gold pin buckle .