Own a piece of history... Rolexes legacy is as the leader of iconic technical tool watches having created many patented innovations including the screw down crown, anti-magnetic casing, helium release valve, the ratchet bezel... The model that revolutionized Rolex with the first ratchet bezel, the Turn-O-Graph marks the beginning of the brand’s “golden age”. Used by many of the world’s aviation elite, the Turn-O-Graph soared to popularity when it became the official timepiece of the U.S. Air Force’s aerobatic squadron, The Thunderbirds. Manufactured for only one year in 1953, the Rolex Turn-O-Graph ref 6202 was created with a black ratchet bezel with red arrow to mark the time of submerging under water and minute markers in white designed to clear designate elapsed time, allowing the diver to resurface before running out of oxygen...this is the parent and grandparent of the famed Submariner which was introduced one year later, and soon after the first dual time zone watch the Rolex GMT. Ours is in excellent condition with very strong lugs, original insert, dial, hands, crown, period bracelet, period box, and authenticated and guaranteed original.