Quick answer
These are two different watches. The Speedmaster is a manual-wind chronograph built to time events. The Globemaster is an automatic watch with a date and a pie-pan dial, part of the Constellation family. Choose the Speedmaster for a chronograph and flight history. Choose the Globemaster for a 39 mm case, a date, and 100 m water resistance.
Omega Speedmaster vs Globemaster: How to Buy a Replica Without Guessing
Case and size
Speedmaster Moonwatch: 42 mm case, 50 m water resistance, hesalite or sapphire crystal. Globemaster: 39 mm case, 100 m water resistance, sapphire crystal front and back. The Globemaster Annual Calendar uses a 41 mm case.
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Movement
Speedmaster Moonwatch runs calibre 3861. Manual wind, 50 hours of power reserve, Master Chronometer certified. Globemaster runs calibre 8900, or 8901 with the annual calendar. Automatic, two barrels, 60 hours of power reserve, resistance to 15,000 gauss.
- Speedmaster: chronograph, no date on the Moonwatch
- Globemaster: date at 6 o'clock, no chronograph
- Both: co-axial escapement, silicon balance spring, METAS certification
Dial and bezel
The Globemaster dial has 12 facets and a raised center, the pie-pan shape. Steel models use a fluted tungsten carbide bezel. The Speedmaster has a black step dial, three subdials at 3, 6 and 9, and a tachymeter bezel.
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Replica checks
Replica Speedmaster: check subdial spacing at 3, 6 and 9. Check that the subdial at 6 is running seconds and not a 12-hour counter. Press the pushers: a real chronograph starts, stops and resets with a firm click.
Replica Globemaster: count the dial facets (12). Look at the fluted bezel edges and the date font. Check that the applied index feet sit flush. The pie-pan dial is the hardest part to copy, so the facet lines show the quality first.
Price
Retail for both sits in a similar range. Check current pricing at an authorized dealer before you compare. Replica pricing varies by factory and by movement.
Which one
Pick the Speedmaster for a chronograph, a 42 mm case and NASA flight history from 1965. Pick the Globemaster for a date, a thinner profile and higher water resistance. Both take a strap change, and both are common replica models.