The Omega Speedmaster Professional Moonwatch Ref. 105.012-65 is the exact vintage reference issued to Apollo 11 astronauts Neil Armstrong and Buzz Aldrin, making it the first watch worn on the Moon. Produced between 1965 and early 1967, this 42mm stainless steel chronograph introduced the asymmetrical case with crown guards and the "Professional" inscription on the dial while retaining the legendary manual-winding Caliber 321 movement.

• Movement. Powered by the manual-winding Omega Caliber 321, a 17-jewel column-wheel chronograph based on the Lemania 2310 operating at 18,000 vph with a 45-hour power reserve. 

• Case Dimensions. Crafted from stainless steel measuring 42mm in diameter, 47.3mm to 47.5mm lug-to-lug, roughly 14.2mm thick, and featuring a 20mm lug width. 

• Case Design. Features the debut asymmetrical twisted-lug profile designed by Huguenin Frères to protect the crown and pushers, paired with a double-bevel screw-down caseback stamped with the Hippocampus emblem. 

• Dial & Crystal. Houses a matte black "step" dial with tritium hour markers ("T Swiss Made T"), an applied metallic Omega logo, and a domed Hesalite (acrylic) crystal with an etched central Omega logo. 

• Bezel. Fitted with a black aluminum tachymeter bezel featuring the period-correct "Dot Over 90" (DON) and "Dot Diagonal to 70" layout.

• Historical Significance. Because Neil Armstrong's Apollo 11 watch (now in the Smithsonian National Air and Space Museum) was a 105.012-65, this sub-reference commands high collector prestige among pre-Moon Speedmasters.

• Key Authenticity Details. Collectors scrutinize examples for unpolished case bevels, original wide-and-short pushers, an A1 24-tooth crown, and a matching flat-link steel bracelet (such as Ref. 1035, 1039, or 1506).