Short answer
A fake Omega Aqua Terra 323 is a replica of the Seamaster Aqua Terra 150M, and "323" is not an Omega reference number. Omega builds its references from long dotted strings such as 220.10.41.21.03.001, where each block stands for case type, material, size, movement, and dial color. Three digits cannot carry that much information, so a title built around 323 is a seller's internal code. Judge the watch on the dial, the movement, and the caseback, not on the number in the listing title.
What the 323 code usually means
Replica sellers shorten long factory names into short codes so listings are easier to search. That is fine as a shopping label, but it tells you nothing about what is inside the case. When I look at a listing like this, I ask for the full reference, the case size, and the caliber. A genuine Aqua Terra 150M from the Master Co-Axial era runs an 8900 or 8800 movement, and the seller should be able to say so without checking a spec sheet. If the answer is vague, assume the code is marketing.
Dial and date window
The teak dial is where most copies give themselves away. Genuine grooves are cut deep and stay even as they run toward the center, and the horizontal lines continue cleanly into the date aperture. On cheaper replicas the grooves flatten in the middle and the printed outer track looks heavy, almost doubled. Check the date font too. The real one is thin and tall, and the window sits square to the dial. Under 12, the Omega symbol and the word Seamaster should be crisp with even spacing. On a fake, that text tends to sit a hair too low or too close to the logo.
Movement and caseback
Master Co-Axial Aqua Terras since 2015 come with a display back, so the movement is on show. Genuine calibers have circular Geneva stripes, blued screws, and a rotor with the Omega logo and caliber number cut sharply. On a replica the rotor engraving is shallow, the jewel count often does not match the claimed caliber, and the finishing looks stamped rather than striped. A solid steel caseback on a watch sold as a modern Aqua Terra is a warning sign. Older quartz models did have solid backs, so confirm the model year before you decide.
Case, bracelet, and clasp
- Case flanks are brushed with polished bevels that catch light in a straight line. Rounded, soft edges point to a copy.
- Bracelet links should line up flush with no gaps at the lugs, and many references use screw-in pins rather than friction pins.
- The clasp engraving is deep and centered, and the folding action has a firm, even snap.
- The crown is signed, sized to the case, and screws down with a hard stop instead of a mushy one.
- Lume on the hands and markers glows evenly and fades at the same rate across the dial.
Price and paperwork
New steel Aqua Terra 150M models list in the low five figures at US boutiques, and used pieces hold value well. That spread matters. A listing at $80, one at $400, and a genuine watch are three different objects, and the middle option is not a bargain version of the third. Genuine watches ship with a box, a warranty card, a pictograms card, and a Master Chronometer certificate whose numbers match the case. Replicas often include a card with no matching serial or a certificate printed for the wrong movement.
Checks I run before paying
- Ask for the complete reference and the caliber, then compare both against Omega's own product page.
- Request a short video of the seconds hand sweep and the date flipping over at midnight.
- Zoom in on the caseback engraving and the rotor, not just the front of the watch.
- Confirm the bracelet link style and the clasp markings with a close-up photo.
- Compare the asking price to recent sold listings for the same reference.
None of these steps needs a loupe or a watchmaker. They need a seller who will answer questions and send real photos of the actual watch. If that is too much to ask, keep looking.