Quick answer
Omega does not make a 45mm Globemaster. The Globemaster case is 39mm. The Globemaster Annual Calendar is 41mm. No Omega catalog entry uses 45mm for this name. A product sold as a "replica Globemaster 45mm" carries the trademark on a case size the brand never built. In the United States, importing or selling that product is illegal.
Real Globemaster sizes
- Constellation Globemaster, launched 2015: 39mm case, 100m water resistance, pie-pan dial.
- Globemaster Annual Calendar, launched 2016: 41mm case, three calendar apertures below 12 o'clock.
- Constellation 28mm, 39mm, and 41mm models use the Constellation name, not Globemaster.
The 2015 Globemaster was the first watch certified as a Master Chronometer by METAS, the Swiss Federal Institute of Metrology.
Where the number 45mm comes from
Large cases are common in diver and chronograph lines. Sellers add "45mm" to reach buyers who want a bigger watch. The figure also comes from measuring the case with the crown or the lugs, which adds 3mm to 5mm. A 39mm watch measured that way reads as 43mm or more. Case diameter across the bezel, crown excluded, is the number that matches a catalog spec.
Parts on the genuine watch
Fluted bezel in tungsten carbide. Pie-pan dial with applied markers. Co-Axial Master Chronometer movement in the 8900 family, 60-hour power reserve, 15,000-gauss magnetic resistance. Sedna gold, steel, or two-tone case. Caseback with an engraved observatory medallion. A Master Chronometer card and a serial number that an Omega service center can check.
Legal status in the US
19 U.S.C. 1526 bars import of goods that carry a counterfeit mark. CBP officers seize those shipments. The importer gets no refund and can face a civil penalty. 15 U.S.C. 1114 covers sale in commerce. 18 U.S.C. 2320 makes trafficking in counterfeit goods a federal crime with a prison term of up to 10 years for a first offense. A seller who ships a fake watch across state lines falls under that statute.
How copies differ
- No METAS certification and no Master Chronometer test card from an accredited lab.
- Case metal is plated brass or 316L steel, not Sedna gold.
- Bezel is coated steel, not tungsten carbide.
- Most copies run at 28,800 vph. The 8900 family runs at 25,200 vph, with a Co-Axial escapement and a silicon balance spring.
- Serial number does not appear in Omega records.
Bottom line
A 45mm Globemaster does not match anything Omega sells. The name on the dial is the only part that matches. Buyers who want the real proportions look at 39mm. Buyers in the US who order a fake risk seizure at the border and a lost payment.