For the reader who is unaware, the Prospex logo and the statement of “Diver’s” means that this piece, and all other Propsex pieces, meet the International Organization for Standardization (ISO) 6425 testing criteria for diver’s watches. To keep this segment short, it shall suffice to say that such ISO minimum testing criteria for mechanical diver watches covers water resistance, hot and cold condensation tests, resistance to external forces, thermal shock, movement-dynamic tests, the presence of time-preselecting components (uni-directional bezel or similar timer), strong luminosity upon all indices/hands, magnetic resistance, shock resistance and resistance to salt water.