Description: Omega Speedmaster Calibre 321 Pre-owned Omega Speedmaster Calibre 321 ref 311.50.39.30.01.001 is a remarkable tribute to the very first Speedmaster from 1957, the legendary CK2915. Omega designed this model to celebrate the collection’s early history while showcasing the revival of the historic Calibre 321 movement, the same chronograph architecture that powered the original Speedmasters worn during NASA’s early space missions. The 38.6mm case