John Glenn wore a Heuer Stopwatch 2915A in space.
The watch that John Glenn wore was made as a stopwatch so that he could record specific intervals of time while in the Friendship 7. The watch itself was manufactured by Heuer to be a stopwatch and was the first Swiss made watch in space. There were no special modifications needed for the watch to function properly in space, though Glenn did have a special elastic band fitted to the watch so it could be worn outside of his spacesuit.
The original Heuer Reference 2915A is no longer in production as such, so we think the next best alternative is the Tag Heuer Carrera. The Carrera features a fantastic chronograph that John Glenn would be sure to admire. This watch also features a 41.5mm stainless steel case with an anti-reflective sapphire face. It is rated as water resistant up to 100m (330 feet). This makes the watch a practical choice for a day at the pool or beach, but unsuitable for diving.
If you’re looking to sport a watch with the same spirit and character that John Glenn took into space, you’ll want to pick up the TAG Heuer Carrera.