Speedmaster Moonwatch 145.012

Last Speedmaster with caliberCaliberThe designation of a watch movement, identifying its design or movement family. 321. Screwed-in “SP” pushers with larger caps for better water resistanceWater resistanceA watch’s ability to resist water entering its case under specified conditions, often stated as a pressure or equivalent depth. Seals can deteriorate and the crown can be damaged, so an original rating does not establish a vintage watch’s present resistance.; otherwise close to the 105.012. Michael Collins wore one on Apollo 11. The most-produced 321 Speedmaster.