Blancpain Fifty Fathoms Flyback A diving wristwatch in mint condition, with flyback chronograph, full calendar and moon phase - with original box, leather wallet, guarantee card and booklets Ref. 5066F-1140-52B, Cal. 66BF8, Case No. 645, Dimensions 45 mm, circa 2014, Origin Swiss Case: steel, glazed screw back, unidirectional rotating bezel with 60 minutes division, screwed crown and pushers, original strap with steel deployant clasp. Dial: blue, engine-turned centre, luminous indexes and hands. Movm.: Automatic. In 1953 Blancpain was commissioned by the French military to develop a mechanical, automatic wind diver’s watch with a unidirectional bezel that featured a graded Bakelite insert to display the diving time. The watch was named "Fifty Fathoms", because it was water-resistant to a depth of 50 fathoms (1 fm = 1,829 m), i.e., 91.45 m. Paying homage to the early diver’s watches, new and extravagant models were created, making use of avant-garde materials to set hitherto unsurpassed technical standards. Case: as new. Dial: as new. Movm.: as new, capable of running. Case: as new. Dial: as new. Movm.: as new, capable of running.