This is a new and unworn watch While the Black Bay line references a range of TUDOR early dive watches, the all new Black Bay 54 is the most true to form example of TUDOR first dive watch, the reference 7922. The 37mm case retains the classic proportions of yesteryear yet boasts the technical prowess of TUDOR time only Manufacture Calibre MT5400 and a 200m depth rating. True to form, the unidirectional bezel is devoid of any graduated hash marks, echoing the days of the early '50 when SCUBA diving was in its infancy and TUDOR produced a watch for those daring enough to engage with the burgeoning sport.