Replica Omega SpeedMaster Watches

NASA supplied each of the Apollo astronauts with a standard issue Omega Speedmaster Professional manual-wind wristwatch (pictured above) together with Velcro strap. Aside from its primary and obvious function, the Omega Speedmaster Professional also incorporated a chronograph (stopwatch) via the large third hand on the watch dial. The three interior dials on the face provided respectively a) a second-hand, ancillary to the conventional time function b) a minute elapsed counter for the chronograph and c) an hour elapsed counter, again related to the chronograph function. The outside of the dial included a fixed bezel incremented to act as a Tachymeter (to measure miles per hour) in conjunction with the stopwatch function, hence the title "Speedmaster".
The Omega Speedmaster Watches had initially been worn on many of the pre-Apollo NASA manned space missions after satisfactorily passing exhaustive tests aimed at determining performance reliability in the conditions likely to be experienced during EVA. The first American to walk in space Edward H. White wore a Speedmaster during his Gemini 4 spacewalk and there are some unconfirmed reports that suggest the manufacturer only discovered its use by NASA after that event.