About Omega Speedmaster
While the original 1957 Omega Speedmaster was produced as a sports and racing chronograph, the line is better known as the first watch on the moon. The Speedmaster Professional, also known as the "Moonwatch" model after its Apollo 11 debut, is one of the longest-produced models from Omega, and remains the only watch qualified by NASA for use during extravehicular activity. While the newer Speedmaster Co-Axial Chronograph comes in the line's standard stainless steel, Omega has produced versions in platinum and 18 karat orange gold, which are powered by the Co-Axial calibre 9301 that includes an 18 karat red gold rotor and balance bridge. Other changes to the newer model include two sub-dials instead of three, a slimmer body design, and a non-magnetic silicon balance spring.