Pre-owned in good condition Patek Philippe patented Annual Calendar launched in 1966, 38.5 mm rose gold case, silvered opaline dial with applied rose gold hour markers, self winding mechanical movement caliber 26‑330 S QA LU 24H/441, Annual Calendar. Day and month in apertures. Date by hand. Moon phases. 24-hour indication. Sweep seconds . Exhibition case back, Sapphire crystal, water resistant to 30 meters, on a leather strap with folding buckle. This watch has box only.