41. Audemars Piguet. A very fine stainless steel automatic calendar bracelet watch Audemars Piguet. A very fine stainless steel automatic calendar bracelet watch Model: Royal Oak '50th Anniversary Reference: 15510ST.00.1320ST.09 Date: Purchased 25th January 2023 Movement: 32-jewel Cal.4302 automatic Dial: Grande Tapisserie green grid, polished baton hour markers with luminous inserts, white outer minute divisions, date aperture at 3, polished baton hands with luminous inserts, centre seconds Case: Brushed and polished tonneau form, exhibition back secured by 8 screws, 8 screws to bezel, screw down crown, No.NP8331A-DE8288 Strap/Bracelet: Fitted brushed and polished steel link Buckle/Clasp: Signed double folding clasp Signed: Case, dial & movement Size: 41mm Accompaniments: Box, outer card, International Guarantee card, original invoice dated 25/01/2023