Omega Caliber 3304

Brand	Omega
Caliber Number	3304
In-House?	No
Base Caliber	ETA/Valjoux 7750
Movement Type	Automatic, self-winding mechanical, chronograph
Chronometer?	Yes (COSC)
Diameter	30mm
Height	7.9mm
Jewels	27
Beat Rate / Frequency	28,800 bph / 4 Hz
Power Reserve	48 hours
Balance	Glucydur
Regulator	ETACHRON
Hand Count	6
Chronograph Layout	3-6-9
Features	Central hours; central minutes; central chronograph seconds; small seconds at 9:00; 30 minutes counter at 3:00; 12 hours counter at 6:00; date at 6:00
Country of Manufacture	Switzerland, Swiss made
Known Models	323.30.40.40.06.001 (Add your watch to the comments below…)

The Omega caliber 3304 is an automatic chronograph movement based on the ETA 7750 (unlike 3301, 3303, 3313 that were based on column wheel Piguet movements). It was released in November of 2009.

This calibre is used in the Speedmaster Date (Ref: 323.30.40.40.06.001). It replaced the previous caliber 1164.

Caliber Commentary:

From ChronoScot on watchuseek:

The newer cal 3304 has one specific technical difference to the cal 1164 that might have a slight bearing on your choice – the date of the cal 3304 is adjusted using a push button at the 10 o’clock position, while the cal 1164 uses the regular crown adjustment. I don’t believe that one is better than the other, it’s rather just a matter of preference on whether you want to use a pen or similar to change the date.

Additional Resources: