A fake Omega Speedmaster 38mm almost always fails on four checks: the case measures larger than 38 mm, the lugs are 20 mm instead of 18 mm, the movement is a stock chronograph instead of the co-axial calibre 3330, and the dial uses printed or soft-edged details where the genuine watch uses crisp applied elements. Because the Speedmaster 38 is a smaller alternative to the 42 mm Moonwatch, counterfeiters target buyers who want the proportions without the price, so the fastest way to authenticate is to measure the case and inspect the movement through the display back.
Which Speedmaster 38 details do counterfeiters get wrong?
The genuine Speedmaster 38 is a 38 mm co-axial chronograph built around the Omega calibre 3330. Copies are usually assembled from generic 38 to 40 mm chronograph cases, so a tape measure or caliper settles most doubts in under a minute.
- Diameter: exactly 38 mm across the case, not 39 or 40 mm.
- Lug width: 18 mm between the lugs, so a 20 mm strap should not fit.
- Lug shape: Omega lyre or twisted lugs with alternating brushed and polished surfaces, not a plain slab-sided case.
- Crown and pushers: signed crown, firm chronograph pusher action, no wobble or grinding.
- Crystal: domed sapphire with anti-reflective treatment on both sides, so reflections look faint and slightly blue from an angle.
How do you check the calibre 3330 movement?
The authentic Speedmaster 38 runs the Omega calibre 3330, a 28,800 vph automatic chronograph with a co-axial escapement and a Si14 silicon balance spring, rated to a 52-hour power reserve. Many references use a sapphire display back, which means you can verify the movement without opening the watch.
- Rotor engraving should read Omega 3330 with arabesque finishes, not a blank rotor or an ETA stamp.
- Co-axial text appears on the movement and, on most dials, near the branding.
- Chronograph start and stop should feel crisp; reset should snap back to zero instantly.
- Subdial spacing should sit tight against the centre, a hallmark of the correct calibre rather than a standard Valjoux 7750 layout.
Which dial and case back details give a fake away?
Look at the applied Omega symbol at 12 o'clock, the polishing on the hands, and the depth of the printed text. Genuine printing sits flat with sharp edges, while copies show thick, bleeding lettering and lume that glows unevenly or not at all.
- Subdial layout and date position must match the exact reference you are buying.
- The case back reference number must match the paperwork, and the serial must repeat on the movement.
- Bezel finish and scale should match the reference; mixed steel, gold, and diamond bezels exist, so compare like for like.
What price signals a counterfeit Speedmaster 38?
Genuine Speedmaster 38 chronographs new sell in the mid four-figure to low five-figure US dollar range depending on materials, and used examples hold value well. Fakes typically sell between 150 and 600 dollars. A sealed box, full set, and steep discount from a private seller is a common counterfeit package, so treat any price far under grey market value as a warning rather than a bargain.
How should you verify one before paying?
- Request timestamped photos of the dial, case back, movement, and lume in one session.
- Ask for a video of the chronograph starting, running, and resetting to zero.
- Compare the reference number against the warranty card and pictograms.
- Have an independent watchmaker with an Omega parts account open the case before money changes hands.
- Pay through an escrow or credit card so a counterfeit can be disputed.
Frequently asked questions
Is there a fake Speedmaster 38 with a working chronograph?
Yes. Most copies use a 7750-derived movement, so the chronograph runs, but the subdial spacing, pusher feel, and rotor engraving do not match the calibre 3330.
Can a Speedmaster 38 be authenticated from photos alone?
Often the case size, lug width, and dial printing are enough to raise suspicion, but a definitive answer requires the case back to be opened by a qualified watchmaker.
Does a serial number prove the watch is genuine?
No. Counterfeiters copy serial numbers, so the number must match across the movement, case back, and documents, and even then it should be confirmed by Omega or an authorised service centre.