For well over half a century, the OMEGA Speedmaster has been at the heart of many great moments in time that have tested the limits of physical endurance and human courage, including the first manned lunar landing in July of 1969 and every single one of NASA’s manned missions since March of 1965.
Here is a great article from Omega
http://www.omegawatches.com/collection/speedmaster/moonwatch/presentation/speedmaster-professional
