Omega · Automatic

Caliber 1164

The Omega caliber 1164 is an automatic chronograph movement found in various Seamaster and Speedmaster watches. This calibre was used starting circa 1992~1993, later to be replaced by watches with the Omega 3304 in the mid to late 2000s. The cal. 1164 is not an in-house movement, nor in-house modified caliber. It is basically an ETA caliber 7750 with custom branding. It appears that the 1164 is produced and assembled by ETA to Omega specs, then cased by Omega. One thing to note is that the 7750 is a day-date movement in it’s stock form. For the Omega 1164, the day of the week calendar function was removed.