Speedmaster Professional replicas fall into three groups by movement. The movement sets the subdial layout, the case thickness, and the feel of the pushers. A replica built on a Seagull ST19 keeps the subdials at 3, 6, and 9 o'clock. That matches the Omega Moonwatch. A replica built on a Valjoux 7750 moves the subdials to 6, 9, and 12 o'clock and adds a date at 3 o'clock. That layout is wrong for a Speedmaster Professional. Quartz replicas copy the outside and use a battery movement with a seconds hand that ticks once per second. The genuine watch beats 6 times per second at 21,600 vibrations per hour, so the small seconds hand sweeps.
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Case and dimensions
Omega lists the Moonwatch Professional at 42 mm across and 13.2 mm thick, with 20 mm lugs. Replica cases run from 39 mm to 44 mm. The 7750 case is the thickest at 14.5 mm to 16 mm, because that movement is an automatic with a rotor. A Moonwatch caseback is solid on the hesalite version and has a flat sapphire window on the sapphire version. Many replicas use a domed display back that shows a rotor. Check the lugs. Genuine lugs measure 20 mm at the spring bar. Some replicas use 22 mm, which forces a wider strap.
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Crystal and bezel
The standard Moonwatch uses a hesalite crystal. The sapphire version uses sapphire on the front and the back. Replicas use mineral glass, acrylic, or sapphire. Mineral glass scratches. Acrylic scratches and can be polished. Sapphire resists scratches. Bezels differ by year. Speedmaster bezels made before 1970 place the dot above the 90 on the tachymeter scale. Bezels made after 1970 place the dot beside the 90. Replicas mix the two, so a replica of a recent reference can carry a dot over 90 bezel.
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Dial and hands
Check the printed text. The Moonwatch dial carries OMEGA at 12 o'clock, SPEEDMASTER below it, and PROFESSIONAL above the 6 o'clock subdial. Subdial hands on the genuine watch reach the outer track markings. Short subdial hands are a common fault on replicas. The OMEGA name and symbol are applied metal on the dial, with printed text under them. Many replicas print the logo. Some dials have a raised step between the minute track and the hour markers. The width of that step is a gauge of dial quality.
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Movement numbers
Calibre 1861: manual wind, 21,600 beats per hour, 48 hours of reserve, column wheel, horizontal clutch. Calibre 3861: manual wind, co-axial, Master Chronometer certified, 50 hours of reserve. The Seagull ST19 is manual wind with a column wheel and runs at 21,600 beats per hour. The Valjoux 7750 runs at 28,800 beats per hour and winds by rotor. A 7750 replica sounds and feels different from the real watch. The pusher feel is soft and the rotor spins when the watch moves.
Prices
Quartz replicas sell for $30 to $80. ST19 replicas sell for $120 to $350. Modified ST19 replicas with a sapphire crystal, a correct bezel, and a decorated movement sell for $300 to $600. A used genuine Moonwatch with a hesalite crystal sells for about $4,000 to $6,000 on the secondary market. That gap is the main reason buyers compare replicas.
Compare two replicas side by side
- Measure the case width and thickness with calipers. Compare both numbers to 42 mm and 13.2 mm.
- Count the subdial positions. A Moonwatch has 3, 6, 9.
- Time the small seconds hand for 60 seconds. A sweep means a mechanical movement. One tick per second means quartz.
- Press the top pusher. A crisp click and a snap back points to a column wheel.
- Set both watches to the same time and check the reset. Subdial hands on a 7750 can land off center.
Legal note
Omega owns the Speedmaster name and the trademark. US Customs and Border Protection can seize counterfeit watches under 19 CFR Part 133. A watch with no Omega name or logo falls outside that rule.