Omega Caliber 1128

Omega Caliber 1128

Omega Caliber 1128

Manufacturer Omega
Caliber Number 1128, 1128A
Base Caliber
Omega 1120 (ETA 2892-A2)
In-House?
No
Movement Type
Automatic, self-winding mechanical, GMT
COSC?
Yes
Lignes
11.5”’
Diameter
25.6mm
Height
5.05mm
Jewels 23
Beats Per Hour
28,800 vph, 4Hz
Lift Angle
51 degrees
Power Reserve
44 hours
Hand-Windable?
Yes
Hand-Winding Direction
Clockwise (forward)
Time Setting Direction
Counterclockwise advances hands forward
Co-Axial?
No
Shock Protection
Incabloc
Balance Spring
Nivarox 1
Regulator
Etachron
Rotor Type
Ball bearing system
Hand Count
4
Hand Sizes
1.8mm / 1.5mm / .9mm / .25mm
Functions Central hours; central minutes; central sweeping seconds; central GMT hand; date at 3:00
Hacking Seconds? Yes
Country of Manufacture Switzerland, Swiss made
Known Models
Omega Seamaster GMT “50 Years” Ref: 2234.50.00 (newer Speedy bracelet/clasp), 2534.50.00 (old style bracelet/clasp), 2538.20.00 (white dial on newer Speedy bracelet), 2134.80.00 (gold on bracelet), 2634.80.93 (gold on a strap) (Add your watch in the comments below…)

The Omega caliber 1128 is an automatic GMT watch movement with 23 jewels and a beat rate of 28,800bph (4Hz). This Swiss made movement is found in the Omega Seamaster GMT 50th Anniversary Edition, which was released in 1998 to commemorate 50 years of the Seamaster collection.

Omega 1128 VS 1120:

The cal. 1128 is based on the calibre 1120 with the addition of a GMT (second time zone) complication. Most of the parts are interchangeable between these two calibers, with exception to parts related to the GMT.

True GMT:

The 1128 is a “true” GMT with the ability to set the main hour hand independently when jumping time zones – crown pulled out one click. This allows for your home time to remain the same, without adjusting the minutes or hacking the seconds while moving the hour hand forwards or backwards in accordance to your new local time – this method is also used to set the date and can be done in either direction. The GMT hand is set by pulling the crown out two clicks to set the time.

Anti-Magnetic Shield:

The 1128 is not equipped with the robust anti-magnetic technology found in the newer Omega in-house calibers (such as the Omega 9920), but the movement does include an antimagnetic iron dust cover (it is NOT a faraday cage) that is positioned between the movement and the caseback. Although you may find different numbers (or no numbers) on these shields, the example pictured here is number 096 FE 0041 (096FE0041) is common in Seamaster models.

Omega Antimagnetic Dust Cover Shield 096fe0041

Additional Resources:

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Steve Schlichting
Steve Schlichting
5 months ago

My 50th Anniversary Seamaster has a gold omega part on the clasp. Is this on the newer or older Anniversary watches….And if the movement is not in house….Then who is the manufacturer???? Thanks Very Much, Steve

keepthetime
Admin
5 months ago

Hi Steve, the “Bond” style bracelet with the gold Omega logo on the clasp is the 2534.50.00 (released circa 1998). This style came out first. Later (not exactly sure when), the model number was changed to 2234.50.00, and the bracelet was updated to the “Speedy” style with a heavier clasp. As for the movement, it basically adds a GMT complication to the original Omega 1120, which is essentially a modified ETA 2892A2 – not designed and developed by Omega, therefore not an Omega in-house movement. The 50th Anniversary Seamaster GMT is a very cool watch, enjoy!

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