TUDOR Ref: 7928, 'Submariner' A very fine and extremely rare, self-winding, stainless steel diver’s wristwatch with Rolex riveted bracelet Ref. 7206. Made circa 1964 DIAM: 39 mm NOTE: The 7928 was the first Tudor 'Sub' to feature crown guards and it is perhaps one of the most classic Tudor sports models. It saw a long production run from approximatly 1959 (earliest caseback with a 300.xxx serial) till circa 1968. There are several versions of the 7928 with different types of dial