- Movement: hand-wound Omega 1863 ("deluxe finish" Lemania 1873) chronograph with cam-and-lever switching.
- Case: ref# 3573.50.00, stainless-steel, ~42mm Ø.
- The Speedmaster Professional, otherwise known as the "Moonwatch," is the only watch certified by NASA for Extra-Vehicular Activity (i.e., in the vacuum of space) and the only watch ever to be worn on the Moon.
- This example features a limited-edition dial created to celebrate the 50th anniversary of the creation of the first Speedmaster Professional in 1957.
- Beyond having a special 50th Anniversary edition dial, this particular example also features other upgrades over the standard Speedmaster: the standard-finish 1861 movement has been replaced with a deluxe-finish 1863 movement, the standard plexiglass crystal has been replaced by a scratch-proof sapphire crystal, and the standard solid caseback has been replaced with a display-back so you can admire the handsome deluxe-finish movement.
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