The 3539.50 men's watch model was created in 1957, “flight-qualified by NASA for all manned space missions” in 1965, tested at zero gravity, in magnetic fields, under conditions of extreme shocks, vibrations and temperatures (-18 to +93 ºC). The Speedmaster Professional 3539.50.00 automatic mens wristwatch is today a part of the standard EVA (Extra Vehicular Activity) equipment of all astronauts for their walks in space. The Speedmaster 3539.50 men watches made six moon landings with reliable automatic chronograph and was worn by the 1st man to walk on the moon-Neil Armstrong and the last Apollo 17 commander. This 3539.50.00 Speedmaster model is available in stainless steel with a beautiful black dial. This watch features all stainless steel bracelet with black dial.