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The Omega Speedmaster ref. 105.003 is called the "Ed White" with good reason link – it's the reference astronaut Ed White wore when he became the first American to perform a spacewalk during the Gemini IV mission in 1964. White died during a link launch-pad test of Apollo 1 systems link in January of 1967, but the watch lives on to commemorate his pioneering role in manned space flight.

Inside the movement a pair of heart-shaped cams are connected to the center wheels individually each equipped with spring-loaded levershammers that ensure the cams are positioned link correctly along the hollow tubes to bind them together. These hammers act as zero-reset mechanisms on the chronograph center wheel to return the chronograph seconds to link the zero position and to allow the rattrapante seconds hand to catch up to the link chronograph seconds hand.