Michael Collins is documented wearing 2 watch lines: Omega Speedmaster, Omega Speedmaster Apollo. Each watch below links to its strap size and story.
The Apollo 11 command module pilot wore a Speedmaster in orbit. As director of the National Air and Space Museum he later wore a flown Apollo 11 Speedmaster to work every day, until an inventory showed it was actually Armstrong's.
20 mm
Most common strap size on this line: 20 mmCases 42 to 43 mm
Source: Watchfinder, Smithsonian Magazine
The Apollo 11 astronaut owned a gold Speedmaster Apollo XI BA145.022-69, sold at Heritage Auctions on June 1st 2022.
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