Earlier this year, Omega announced that many of us hoped for (in some cases, for decades) which was that, after a five-decade hiatus, one of the major classical movements of mid-century watchmaking would return to production. The movement used to be, and now (it feels good to be able to use the present tense about this caliber) Omega 321 caliber, derived from caliber 27 CHRO C12, which is a chronograph, with a 12 hour recorder, developed in 1942. This movement, in various forms, will continue have the most famous career, but one of the most famous iterations is the 321 caliber chronograph movement. Omega caliber is used in a number of Omega watches but is probably the most famous because it was used in the Speedmaster. That was the movement Omega used in the first Speedmaster watch – reference 2915, and it was the movement used in the first Omega to go into space, which was the work of Walter "Wally" Schirra, on the Mercury Atlas 8 board, in 1962 (no who have history, and this kind of coincidence is objectively meaningless, but even so, I always get the fact that Omega Speedmaster first appeared in space the year I was born, and in my birthday several weeks.