Omega Caliber 8803 Watch Movement

Manufacturer	Omega
Caliber Number	8803
Base Caliber	Omega 8800
In-House?	Yes
Movement Type	Automatic
Display	Analog
Diameter	26mm
Jewels	35
Beats Per Hour	25,200 vph
Lift Angle	Unconfirmed (use Co-Axial compatible timing machine)
Power Reserve	55 hours (one barrel)
Shock Protection	Nivashock
Escapement	Co-Axial
Balance Spring	Si14 Silicon
Anti-Magnetic?	Yes up to 15,000 gauss
COSC?	Yes
Chronometer?	Yes (Omega Master Chronometer spec)
Hacking Seconds?	Yes
Hand-Windable?	Yes
Rotor Type	Ball bearing
Functions	Central hours; central minutes; small sweeping seconds at 6:00; date at 6:00
Finishing	18K Sedna gold rotor and balance bridge and luxury finish with Geneva waves in arabesque
Country of Manufacture	Switzerland, Swiss made
Known Models	Aqua Terra 150M Co-Axial Master Chronometer Small Seconds 38mm (ref: 220.58.38.20.55.002, 220.55.38.20.99.001) (Add your watch in the comments below…)

The Omega calibre 8803 is a member of the Omega 8000 family of in-house automatic movements. It is Swiss made with 35 jewels. This movement features an anti-magnetic hairspring and a Co-Axial escapement.

Some of the topics covered in this caliber listing:

In Omega’s own words:

“Self-winding movement with Co-Axial escapement. Certified Master Chronometer, approved by METAS, resistant to magnetic fields reaching 15,000 gauss. Free sprung-balance with silicon balance spring, automatic winding in both directions. Small Seconds display at 6H. 18K Sedna™ gold rotor and balance bridge and luxury finish with Geneva waves in arabesque.” –source

Omega 8803 VS 8800:

Since the 8802 is based on the Omega caliber 8800, you might be wondering what the differences are between them. The main difference is that the 8800 has a central sweeping seconds hand and the 8802 has a small seconds subdial at 6:00.

Omega 8803 VS 8802:

There is a similar caliber 8802 with the difference being that the 8803 has an 18K gold rotor and balance bridge (this is what the Au 750 indicates on those components).

Replacement Prices:

The Omega caliber 8803 is an in-house movement and not available for individual purchase, even for Swatch Group parts accounts. At the time of this post, the retail prices of Aqua Terra 150M Small Seconds 38mm watches this movement powers ranges from $27,600 to $43,100 USD.

Additional Resources:

Image credit: Omega SA – if you have better pics of the movement in your watch, please submit them here.