The all-new OMEGA Speedmaster Moonwatch 310.30.42.50.01.002 [Professional Moonwatch] The core of the Speedmaster story is that it was taken to the moon by Armstrong (the watch was left in the lunar module). The OB2 case is made of imported 316L stainless steel with a fine brushed finish and a distinct three-dimensional angle, paired with a ceramic bezel. The dial’s luminescence is made of imported Swiss luminescent material and is produced through multiple repeated printing processes. It is equipped with a “pot lid” sapphire crystal. The case size is 42mm and can be paired with a stainless steel bracelet or a “NATO” military watch strap. The movement is a classic manual winding chronograph movement (3861). Only by playing with a manual chronograph movement can you consider it complete! You won’t know until you try!