Rolex. Montre bracelet en acier avec cadran 4 lignes et PCG mouvement automatique Rolex. A stainless steel automatic bracelet watch with 4 line dial and pointed crown guards Submariner, Ref 5512, Purchased 08th July 1965Rolex. Montre bracelet en acier avec cadran 4 lignes et PCG mouvement automatiqueRolex. A stainless steel automatic bracelet watch with 4 line dial and pointed crown guards Model: SubmarinerReference: 5512Date: Purchased 08th July 1965Movement: 25-jewel Cal.1560 automatic, No.D92164Dial: Black, luminous dot hour markers, baton quarters, white outer minute divisions, polished Mercedes hands with luminous inserts, centre secondsCase: Brushed and polished tonneau form, screw down back, pointed crown guards, screw down crown, bi-directional calibrated bezel, No.1068739Strap/Bracelet: Brushed 7206 rivet Oyster link, end links stamped 382Buckle/Clasp: Signed folding claspSigned: Case, dial & movementSize: 39mm Accompaniments: Punched Guarantee dated 08/07/1965, Service receipt dated 20/05/2019Rolex introduced the ref 5512 in 1959 to substitute for ref 5510 and 6538. The most important features of the new reference were a new wide graduated revolving bezel for the decompression times, a smaller winding crown (from 8 to 7mm) and a protective crown guard. The earliest models featured square type guards which were found not to be easy to use while wearing professional diver's gloves. This particular model features pointed crown guard and a 4 lines dial.This year, Rolex celebrates the 70th Anniversary of this legendary tool watch.