The Omega Speedmaster range includes the first watch to be worn on the moon, a mission that had absolutely zero margin for error. Adding to the collection's impeccable feat is the Speedmaster Racing Collection which is widely used by motorsport professionals worldwide. You can be confident a speedmaster is one of the most precise watches around. This Omega Speedmaster Pulsometer Men's Watch comes equipped with a40mm case, which houses the white dial and hand-made mechanical movement that provides the power. Attached to the case is a leather bracelet for increased comfort on the wrist. The timepiece is water resistant up to 50 metres.