Short answer
There is no 45mm Globemaster. Omega builds the Constellation Globemaster in 39mm for the standard three-hand models and 41mm for the Annual Calendar. A listing that advertises a "replica Globemaster 45mm" is either using the wrong measurement, blending the Globemaster name with a larger Seamaster case, or stuffing search terms. Check the measured diameter before anything else, because on this model the size is the first honest tell.
Real Globemaster specs to compare against
The genuine reference is a small, dense watch. It does not wear like a 45mm dive piece, and any replica that does will feel different on the wrist the moment you strap it on.
- Case diameter: 39mm, roughly 12.9mm thick, about 47mm lug to lug
- Bezel: fluted, with a tungsten carbide insert on steel references
- Dial: pie-pan shape with applied markers and a date at 3 or 6 depending on version
- Movement: Master Chronometer calibre 8900 or 8901, METAS certified, resistant to 15,000 gauss
- Water resistance: 100 meters
- Strap or bracelet: leather with a deployant, or a steel bracelet with a butterfly clasp
The lug to lug figure matters more than the diameter for fit. A 45mm case with the same 47mm span would look like a slab, and no factory gets that geometry right because the original geometry does not exist.
Why the 45mm label shows up in replica listings
Sellers use size words as keywords. "45mm" pulls in shoppers browsing Planet Ocean, Seamaster 300, and oversized fashion watches, while "Globemaster" pulls in everyone searching the Constellation line. Combine the two and you get traffic from both camps. Some listings also measure the case with crown guards included, or they list a shipping box dimension by mistake.
A smaller group of sellers genuinely ships a 43mm or 45mm case with a fluted bezel and a pie-pan style dial. It reads as Globemaster-ish in a photo, but the proportions are off, the bezel is usually too wide, and the dial sits too deep in the case.
What to inspect on any Globemaster-style replica
- Case diameter and thickness. Ask for caliper photos. Numbers typed in a listing are marketing, numbers on a caliper are data.
- Lug to lug. Anything past 49mm will overhang a 6.5 inch wrist.
- Bezel finish. The fluting should be cut, not stamped, and it should catch light in even segments.
- Dial printing. The pie-pan step should be a real step in the metal, not a printed ring.
- Date window. It should be framed or cleanly cut, aligned with the marker row.
- Hands. Faceted and polished, with a sweep that ticks eight times per second on the better movements and stutters on cheap quartz conversions.
- Crown action. Smooth winding, no grit, and a logo that is stamped rather than laser-etched flat.
Movement reality
No replica runs a real calibre 8900. What you get is a decorated Asian automatic, often a Miyota or Seagull base with a plate that mimics the rotor and bridges, or a Chinese clone shaped to hint at a co-axial escapement. The better ones hold time within a few seconds a day and hack properly. The bad ones do not hack, wobble when you set them, and stop overnight. Magnetic resistance claims on replicas are almost always fiction, so keep one away from speakers and tablets if you want it to keep time.
Legal and practical note
Counterfeit watches infringe registered trademarks, and customs agencies in the US and EU seize them in transit. Buying one is not a victimless shortcut, and it is not an investment. If you want the Globemaster look at 39mm, the honest routes are a genuine pre-owned piece, a microbrand with a fluted bezel, or a well-finished homage that does not copy the logo.
Bottom line
If a listing says replica Globemaster 45mm, assume the size is wrong until a caliper photo proves otherwise. The real watch is 39mm, dense, and quiet on the wrist. Anything sold at 45mm under that name is a different watch wearing a borrowed label.