The Short Answer
A listing for a "fake Speedmaster Master Chronometer 323" stacks three claims that do not belong together on a genuine Omega. Calibre 321 is Omega's historic hand-wound, column-wheel chronograph, revived in 2019 for the Ed White and Canopus Gold Speedmasters, and it carries no Master Chronometer certification. Master Chronometer status is granted by METAS to a finished, cased watch that passes an eight-part test, and the Speedmasters that hold it run the 3861 or 9900 movement families. Omega has never sold a Speedmaster calibre 323. The number is seller shorthand, and on most replicas it points to a generic Chinese chronograph movement with Omega-shaped decoration.
What "323" Usually Refers To
Sellers borrow the digits from calibre 321 because the manual-wind, column-wheel layout sounds prestigious. In practice a replica tagged 323 is built on one of three movements: a Seagull ST19 hand-wind chronograph, an Asian 7750 automatic chronograph, or a quartz module in the cheapest tier. None of them is METAS certified, and none is tested as a complete watch. The ST19 can be a decent runner when it is regulated, but it does not deliver the 15,000 gauss magnetic resistance or the accuracy window that Master Chronometer certification requires. If a listing promises both, the promise is marketing copy, not a specification.
How to Vet the Watch Before You Pay
- Request a timed video showing the chronograph starting, running, stopping, and resetting to zero.
- Ask for a photo of the movement with the caseback off, not a stock image from the seller's catalog.
- Compare the movement code in the listing against Omega's published calibre list for the reference being copied.
- Measure the case diameter, thickness, and lug width against the genuine specs for that reference.
- Read the dial text word by word, checking for "Co-Axial Master Chronometer" on a watch that should not carry it.
- Confirm the crystal material and the bezel insert construction, since these are the two most common downgrades.
- Ask which factory built the case and which factory assembled the movement, then check that pairing against buyer reports.
- Confirm the return window and the payment method in writing before sending money.
Red Flags in Replica Speedmaster Listings
- "Master Chronometer" printed on a hand-wind chronograph, which no genuine Speedmaster does.
- A date window on a reference that has no date.
- A movement code that does not appear in Omega's calibre documentation.
- Price far below every other seller offering the same build.
- No movement photos, only marketing renders.
- "Swiss made" claims attached to an ST19-based build.
What You Are Actually Buying
Set expectations around the movement, the case finishing, and the service life. A well-built replica Speedmaster with an ST19 or a serviced 7750 can run for years if you keep it dry and avoid slamming the reset pusher while the chronograph is running. A quartz build will keep time but will not feel like the real thing when you press the pushers. Ask the seller which of these you are getting, get it in writing, and price the watch against that answer rather than against the certification language in the title.