Reservoir Hydrosphere Blackfin, black dial with Arabic numerals. Stainless steel case and bracelet

Hydrosphere blackfin, 45mm, 316L Stainless Steel Case with satin finish, Black Dial, Magnifier on the Jumping-Hour Window, White Index, Unidirectional, Ceramic Rotating Bezel with Double Scale for Reading the Time at different Diving Depths before and after the Retrograde Minute Hand’s Return
Screw-down Crown, Watertight up to 250m, Helium Valve, Stainless Steel Screwed Back, Anti-reflective Sapphire Crystal,
Serial # U1.003494