For its first participation in the Only Watch charity auction, TUDOR has decided to reinterpret one of the least known tool-watches in its history: reference 7923, launched in the mid-1950s. This diving watch use the same aesthetic codes including a glossy black dial with gilt printing, gold baton hands, two lines of text including the depth rating – printed in red on this unique watch, and patinated luminous hour markers. The contemporary-sized, 41 mm case houses a self-winding Tudor caliber 2824 movement, and retains the accentuated bevels and chamfers found on the lugs of the original. A prominent and large screw-down crown adorned with the Tudor rose, domed sapphire crystal, and stainless steel bracelet with historic, tube-type attachments complete the mid-20th century inspired design. Produced in one copy – a first for the company – the Black Day One will be exhibited at the Monaco Yacht Show, from September 23 to 26, 2015 and through different cities in Europe, USA and Asia. This world tour will be followed by an auction for the benefit of the for research on Duchenne Muscular Dystrophy, November 7, 2015 in Geneva.