Answer first
A Speedmaster 40mm replica copies the automatic Speedmaster Date and Day-Date models, not the 42mm Moonwatch and not the 39mm Reduced. The case measures 40mm across. The dial carries three subdials in a 12-6-9 layout. The original runs an Omega 1152, a modified ETA 7750. Replica versions come in three groups: quartz, hand-wound ST19, and automatic 7750 clone. Only the 7750 clone matches the dial layout of the original.
speedmaster 40mm replica omega
Which Speedmaster is 40mm
Omega lists the Speedmaster Professional at 42mm. The Speedmaster Reduced sits near 39mm, though some sellers list 38.5mm. The 40mm group covers the Speedmaster Date (ref 3513.50 and related), the Speedmaster Day-Date (3520.50), and later Racing models. Buyers who want a smaller Speedmaster land on these references, and that demand drives replica supply.
speedmaster 40mm replica omega
Listings labeled 40mm Speedmaster sometimes ship a 39mm or 41mm case. Measure the case before you trust the listing. A 1mm error changes how the watch sits on a 6.5 inch wrist.
Movement options and what they change
- Quartz: thin case, no sweep, subdials often fixed or non-working. Lowest cost, least accurate to the original.
- Seagull ST19: hand-wound, 21,600 vph, subdials at 3 and 9. Wrong layout for a 40mm Date dial. This movement belongs in Moonwatch copies.
- Asia 7750: automatic, 28,800 vph, subdials at 12, 6, and 9. This matches the Omega 1152 base used in the original 40mm automatic Speedmasters.
If a listing shows subdials at 3 and 9 on a 40mm Date-style dial, the movement is not a 7750. Ask for a photo of the caseback and the rotor.
Checks before buying
- Subdial position: 12-6-9 for a 7750 layout.
- Date window: the original sits at 3 o'clock. Check the font and the window cut.
- Case thickness: the original runs near 13mm. A quartz copy often comes in under 11mm.
- Bezel: tachymeter print on the original is fine and even. Blurred print is a common fault.
- Pushers: screw-down on some references, push-pull on others. Match the reference you are copying.
- Bracelet: end link fit and clasp engraving. Loose end links show up in photos.
Water resistance
Replica cases ship with untested gaskets. Claims of 50m or 100m on a listing are not backed by a test report. Do not swim with the watch. A watchmaker can pressure test a case, and many will refuse to service replica movements.
What is not known
Factory names change, and one case can appear under several labels. I cannot verify which workshop builds any single listing. Serial numbers and Swiss made markings on replicas carry no meaning. Treat each listing as an individual watch and inspect photos of the actual unit.