Omega Caliber 1120

Omega Caliber 1120

Omega Caliber 1120

Brand Omega
Caliber Number 1120
In-House?
No
Base Caliber
ETA 2892A2
Movement Type Automatic, self-winding mechanical
Chronometer?
Yes (COSC)
Lignes 11.5”’
Diameter
25.6mm
Height
3.6mm
Jewel Count
23
Beat Rate
28,800 vph, 4 Hz
Lift Angle
53 degrees
Power Reserve
~42 hours
Rotor Style
Ball-bearing
Rotor Winding Direction
Bi-directional
Hand-Windable?
Yes
Anti-Shock Device
Incabloc
Hand Count 3
Hand Sizes
1.5mm / .90mm / .25mm
Functions Central hours; central minutes; central sweeping seconds; date at 3:00
Hacking Seconds?
Yes
Country of Manufacture Switzerland, Swiss made
Known Models
Omega Seamaster Pro Midsize 36 (ref: 2551.80.00) (Add your watch to the comments below…)

The Omega caliber 1120 is an automatic movement found in some Omega Seamaster Pro 300M watches from the mid 1990s (1996?). Technical documentation was found dated May 1995.

Omega 1120 Drawings Wide

 

This movement can be found in both the full-size 41mm and the mid-size 36mm SMP models.

The 1120 is essentially based on the ETA caliber 2892-A2 framework. It has 21 jewels with a beat rate of 28,800 bph, 4Hz.

A note about power reserve: Earlier 1120 documentation stated 42 hours for the 1120, but listings currently on Omega’s website say 44 hours. The ETA 2892A2 which the 1120 is based on has a 42 hour power reserve. It’s safe to say expected power reserve can be somewhere between 42-44 hours.

This movement has a quickset date, hacking seconds, and can be hand-wound.

1109 to 1120:

The cal. 1120 replaced the Omega caliber 1109. That is why some models will have the older 1109 and other will be powered by the 1120. For example, the 2551.80.00 midsize SMP is listed by Omega as having the 1120 here, and the 1109 here.

Omega 1120 VS 1120A:

There is a similar calibre 1120 A with some of the following differences as detailed by official tech sheets:

1120 1120 A
Height 3.6mm 4mm
Power Reserve 42 hours 44 hours
Lift Angle 53 degrees 51 degrees
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4 Comments
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Jorge
Jorge
9 months ago

I got my Omega Seamaster Pro 300, a very unusual style with Roman Sword hands and sinthetic wrist band with hidden clasp, in Berlin at Wempe Friedrichstraße in August 2000, now almost 23 years to the date. The Vereinigung still fresh, DM the official currency; the Euro still a reference that wouldn’t come in circulation until next year and the €/$ exchange rate at just 0.92, the window 1,200€ price, converted from DM, came to just US$1,100. Then the conversion to my native Mexican peso at USD 0.93 brought it furthermore to Mx$10,000 when I had been quoted Mx$23,000 for… Read more »

20230805_194310.jpg
Boots
Boots
8 months ago

It’s 23 jewels and what makes it COSC certified.

SPY006
SPY006
2 months ago

Here’s a picture of the movement:

Sem-titulo
SMPfam
SMPfam
11 days ago

Best finish you can get on an ETA movement imo. I love my mid Seamaster with the 1120. Just wish it has a clear back to see it. The new Seamaster has nothing on the original, especially the 36.

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