View Omega Speedmaster 321 Movement US. On the smaller side, it comes in at 27 mm in diameter and a height of 6.74 mm. Omega speedmaster is a line of chronograph wristwatches produced by omega sa.
Caliber 321 is an exceptionally robust, yet elegant chronograph.
It didn't go to the nothing much has changed bar the movement going from the calibre 321 to the 1861 via the 861 and a few cosmetic tweaks, but this would be. The new 'ed white' 321 speedmaster measures in at 39.7mm in diameter with the 19mm lug gap, set with a steel bracelet reminscent of the original. On the 50th anniversary of the apollo 11 lunar landing, omega has unveiled the first new speedmaster moonwatch to house the iconic calibre 321 movement. This movement builds upon the previous calibers 861 and 321, which omega developed based on the lemania 2310.