OMEGA-SPEEDMASTER Speedmaster MOONWATCH PROFESSIONAL CO‑AXIAL MASTER CHRONOMETER CHRONOGRAPH 42 MM 310.63.42.50.10.001

The movement is unaffected by exposure to strong magnetic fields, even those greater than 1.5 tesla (15,000 gauss).

The chronograph function is a mechanism for measuring time intervals. A chronograph watch can therefore be used to time events while displaying the time like any traditional watch.

Label given to a watch which has undergone precision tests and received a certificate from an official body (COSC).

Guaranteeing the Swiss industry’s highest standard of precision, performance and magnetic-resistance, as set by the Swiss Federal Institute of Metrology (METAS).

A hand on a sub-dial which tracks seconds typically it completes a full rotation in one minute.

A tachymeter watch has a function for measuring speed. It is a chronograph with a graduated dial on which speed can be read in kilometres per hour based on a 1000 metre distance.

A transparent case back - frequently made of sapphire - makes it possible to see the movement inside the watch.

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DIAL AND CRYSTAL

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