153. Audemars Piguet. Montre bracelet en acier avec date sertie de diamants mouvement automatique Audemars Piguet. A stainless steel and diamond set automatic calendar bracelet watch Model: Royal Oak Reference: 15451ST.ZZ.1256ST.03 Date: Purchased 4th June 2021 Movement: 40-jewel Cal.3120 automatic, No.BB1604 Dial: Blue grid, applied luminous baton hour markers, 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.TX2870P Strap/Bracelet: Fitted brushed and polished steel link Buckle/Clasp: Signed double folding clasp Signed: Case, dial & movement Size: 37mm Accompaniments: Audemars Piguet fitted box, outer card, International Warranty Card, Instructions for Use brochure, International Sales Warranty Watches brochure The Royal Oak was first introduced in 1972 and was designed by one of the most famous watch designers Gerald Genta. Over the years Audemars Piguet have released numerous modifications whilst maintaining the key elements conceived by Genta. This respect to Genta's design has created a long lasting legacy that speaks to collectors and enthusiasts alike.