Although I believe the text on this page is from The Moonwatch book by Omega Press, it’s cool to read how astronauts were aware of their Speedmaster watches. However, I read in the book by Gene Cernan that most astronauts were showing off their Rolex GMT-Master watches in their private time.

Update: Another cool link on Speedmasters, thanks to Ecartman at WatchUseek’s OmegaForum.