When Neil Armstrong, Buzz Aldrin, and Michael Collins blasted off from Kennedy Space Center in 1969 to start their trip to land the first humans on the Moon, the three astronauts were decorated with NASA-issued Omega Speedmaster Professional chronographs. 
Decades ago, Neil Armstrong became the first person to step onto the lunar surface, quickly followed by Buzz Aldrin – Michael Collins flew the Command Module Columbia alone in lunar orbit while his two crew members were on the lunar surface. And when Buzz Aldrin stepped onto the Moon, he had his Omega Speedmaster Professional strapped to the exterior of his spacesuit. Ever since then, the Speedmaster became known around the world as the “Moonwatch.”
However, since the Speedmaster is now such a varied collection of different watches, the models famous as Moon watches are the direct descendants of the replica watches worn by the Apollo 11 astronauts. Like their predecessors, the modern Omega Speedmaster Professional Moonwatch models are stainless steel chronographs with 42mm cases, black tachymeter bezels, black dials, and hand-wound movements. The cases of the Moonwatch professionals are asymmetric, featured by twisted lugs and crown guards.
Today, Omega gives the option of Hesalite crystals or modern scratch-resistant sapphire crystal, along with the chance of a matching steel bracelet or black leather strap. Moreover, those Moonwatch models with sapphire crystals on the dial-side also have sapphire on the display case back for a view of the movement inside. Current production Moon watches run on Caliber 1861, which is distinguished from the original Caliber 321 that powered the original Speedmaster Professional fake watches that went to the moon.
We will find a quick rundown of the main design specs between the Speedmaster Professional Moonwatch vs. Speedmaster ’57 next time. These specs apply to the regular-production models and not the unique limited-edition versions.
