Omega Caliber 1150

Brand	Omega
Caliber Number	1150
In-House?	No
Base Caliber	ETA 7751
Movement Type	Automatic, self-winding mechanical
Lignes	13.25”’
Diameter	30mm
Height	7.9mm
Jewels	25
Beat Rate	28,800 vph, 4Hz
Lift Angle	49 degrees
Power Reserve	48 hours
Rotor Style	Ball-bearing
Hand-Windable?	Yes
Anti-Shock Device	Incablock
Regulator System	ETACHRON
Chronograph System	Cam style
Hand Count	8
Functions	Central hours; central minutes; central chronograph seconds; small running seconds at 9:00; 30 minutes chronograph counter at 12:00; 12 hours chronograph counter at 6:00; 24 hour indicator; day of the week at 12:00; month at 12:00; central pointer date hand
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Omega Speedmaster Automatic Day-Date (Ref: 3521.30, 3821.30, 3821.80, 375.0043, 175.0044, 175.0054, 175.0054, 375.0034, 375.0043, 375.0054, 175.0074, 175.0074, 175.0074, 375.0074, 375.0074, 375.0074), Omega Speedmaster “Classic” Triple Date Moonphase (3131.20) (Add your watch to the comments below…)

The Omega caliber 1150 is an automatic triple date chronograph watch movement found in the vintage Speedmaster Day-Date.

Omega 1150 VS ETA 7751:

The Omega 1150 is based on the ETA caliber 7751 triple-date moonphase movement – but with an Omega branded rotor.

Some watch models using the 1150 make use of the moonphase complication at 6:00, and others do not. Models without the moonphase indicator actually have the moonphase removed from the movement, therefore, no phantom moonphase (read the Phantom Date article to learn more about what this means).

This needs confirmed, but it appears that two-tone models were available with the moonphase and all steel models were without it.

Setting the Time/Calendar:

Before getting into setting the calendar, take note that you should not make adjustments to the day/date/month when the time on the dial is set between the hours of 8PM – 2AM (non-moonphase watches) or 8PM – 6AM (moonphase watches). In other words, if the time displayed on the watch is within that range, move the hands to a different time before proceeding to set the date.

Crown Positions / Directions:

• 0 – Winding position
• 1 – Date/month (counterclockwise) and moonphase (clockwise)
• 2 – Time setting mode

The day of the week is adjusted via an inset pusher on the side of the case near 10:00.

Watches With This Caliber:

The first triple-date Speedmaster Classic powered by the 1150 was introduced around 1990 (175.0034) ~ 1991 (175.0044). This model was two-tone with a steel case and a yellow gold bezel. The dial displayed the moonphase indicator at 6:00.

Next was an all steel model introduced around 1993 ~ 1994 (3521.30.00). This cleaner look featured a steel case and bracelet with a more minimalist silver dial, sans moonphase.

In 1995, Omega introduced a solid gold version (175.0054).

Additional Resources:

• More Omega watch movements