Answer
No genuine Omega caliber 3320 was sold loose, and no replica factory builds a movement that matches it. A replica watch with 3320 printed on the rotor holds a different movement. In most cases that is an Asian chronograph with a decorative plate or an engraved rotor. Omega built the 3320 for its own watches and kept the caliber in-house.
What the Omega 3320 is
The 3320 is a self-winding chronograph caliber with a co-axial escapement. Omega used it in De Ville Co-Axial Chronograph models around the mid-2000s. Published spec sheets list 28,800 vibrations per hour, or 4 Hz, and about 52 hours of power reserve. Third-party movement databases list the same figures for the 3313, which shares the family architecture. Omega based that family on the Frederic Piguet 1285. Omega submitted these chronograph calibers to COSC for chronometer certification.
Why a replica cannot copy it
- The co-axial escapement uses a three-level escape wheel and two pallet stones. Omega states the geometry lowers sliding friction at the impulse.
- A standard Swiss lever escapement has one level of teeth and one pallet fork. Most replica co-axial movements are lever escapements with the word printed on a bridge.
- Omega does not supply the caliber as a spare part to third parties. There is no parts channel for a copy.
- No public record exists of a clone maker producing a working co-axial escapement.
Movement checks
- Caseback. Most 3320 references have a display back. If the model should show the movement and the back is solid, ask why.
- Engraving. Omega engraves the caliber number, jewel count, and adjustment data on the bridges and the rotor. Copies print on the rotor alone, and the font fails under magnification.
- Escapement. Look at the escape wheel with a loupe. Three tooth levels mean co-axial. One level means lever.
- Finish. Real bridges carry Cotes de Geneve stripes, rhodium plating, and polished bevels. Stamped brass with printed stripes shows under a loupe.
- Chronograph action. Start, stop, and reset the chronograph. The reset should snap back to zero at once. A soft reset or a drifting hand points to a low-grade module.
What photos cannot prove
Photos cannot confirm the escapement works as designed, that the parts are original, or that the watch keeps time inside chronometer limits. A watchmaker with the movement in hand can confirm the escapement type in minutes. Anything short of that is a claim, not a check.
Reading a listing
Sellers use Omega 3320 as a search term. The phrase appears in replica listings, in parts listings for stripped movements, and in posts from buyers trying to identify what they received. If a listing offers the movement alone, ask for the rotor part number, the jewel count, and a photo of the escape wheel. If the seller cannot supply those, treat the caliber claim as unverified.
What this means in practice
A watch sold with a 3320 label is not the same product Omega sold. The case may look close. The movement is not. Buyers who need the co-axial escapement, the COSC certificate, and the Omega parts supply have one source: a watch from Omega or a used example with paperwork. There is no second source for that caliber.