Quick answer
"Fake Speedmaster 329" does not match any Omega reference number or caliber. Omega lists Speedmaster references as multi-part codes: 3570.50.00 for the classic hesalite Moonwatch, 3573.50.00 for the sapphire version, 310.30.42.50.01.001 for the current generation. Omega also has no caliber 329. The Speedmaster has run on calibers 321, 861, 1861, and 3861. When a seller names a watch "329," that number came from the seller, a marketplace SKU, or a fragment of a caseback stamp. Verify the watch, not the label.
Where the "329" label comes from
Marketplace sellers and replica vendors shorten long reference strings. Some use internal stock codes. Others copy part of a number stamped inside a caseback. A partial number proves nothing about authenticity. Ask for the full reference, the case serial number, and sharp photos of the caseback, dial, and movement. A seller who cannot supply all three is a risk.
Reference number format
Older Speedmaster references use five digits and two decimal groups, such as 3570.50.00. Current references add case size and material, such as 310.30.42.50.01.001. On vintage models the reference appears inside the caseback as a number like 145.022 or 105.012, and it does not appear on the outside of the case. A bare "329" fails this format.
Movement checks
- Caliber 1861 and caliber 3861 run at 21,600 vibrations per hour, which is 6 beats per second. Watch the small seconds hand at 9 o'clock. It should step 6 times per second.
- The 3861 is a METAS Master Chronometer with a co-axial escapement and a 50-hour power reserve. The 1861 has a 48-hour reserve and a cam-switched chronograph.
- A quartz tick, a stutter, or a smooth sweep with no stops points to a non-Omega movement.
Dial and subdial layout
A Speedmaster Professional Moonwatch has three subdials: 30-minute counter at 3 o'clock, 12-hour counter at 6 o'clock, small seconds at 9 o'clock. The Moonwatch Professional has no date window. Fakes add a date at 3 or 4:30, misalign the subdials, or print subdial rings that sit too far from the center. Pushers on a genuine 1861 or 3861 have a firm, short travel with a clean reset to zero.
Caseback and bezel
The steel caseback of the 3570.50 carries the lines "FLIGHT-QUALIFIED BY NASA FOR ALL MANNED SPACE MISSIONS" and "THE FIRST WATCH WORN ON THE MOON," with a seahorse medallion. Engraving on replicas looks shallow, wide, or laser-etched. The tachymeter bezel is another marker: genuine insert printing sits level and fills the scale, while replica inserts show gaps, a soft 90 mark, or a bezel that spins on a friction ring instead of a steel click.
Price context
Used 3570.50 Moonwatches trade in the low thousands of US dollars on the secondary market. Omega lists the current hesalite Moonwatch above $6,500, and list prices have climbed since 2021. A "new" Moonwatch offered at a few hundred dollars is a replica. There is no legitimate closeout channel at that price. Check sales records rather than trusting a seller's stated retail figure, since prices shift each year.
Steps before you pay
- Request the full reference number, case serial, and movement serial.
- Compare the caseback engraving against photos of the same reference.
- Ask for a timed photo of the running chronograph at full reset.
- Check service records, box, and papers against the serial.
- Have a watchmaker open the case before money changes hands.
What stays unknown
No public Omega document uses 329 as a Speedmaster model or caliber code. If a seller cites a source for the number, ask for it in writing. Omega reference lists and auction archives are the place to confirm any code you are given.