Reference 7923 was the only TUDOR Submariner to have been equipped with a manually-wound movement. This technical choice made it a particularly flat divers’ watch. Thanks to its screw-down case back and crown, characteristics proper to the Oyster case, as well as its domed crystal, the waterproofness of the TUDOR Oyster Submariner was ensured to a depth of 100 metres.
Its black lacquered dial was no longer inscribed “ROTOR”, “SELF WINDING” at 6 o’clock since the movement used was not self-winding. In place of these indications, the dial now bore the epithets “SUBMARINER”, “SHOCK RESISTING”. A reminder of the waterproofness was not visible on the dial and the hands used were in baton style, different from those that equipped the first-generation Submariners.
Reference 7923 was equipped with the manually-wound ETA calibre 1182 with a frequency of 18,000 beats per hour. Its Oyster-type bracelet with riveted links, reference 6636, bore the Rolex logo. On the example shown here, two straight cylindrical bars replaced the more common curved end links holding the bracelet to the case.