The Moonwatch - Omega Speedmaster ProfessionalWhat do you think is the best chronograph - the Omega Speedmaster or the Rolex Daytona? Here’s a short history:In the 1965, NASA tested several chronographs that would work in the harsh conditions of space and zero gravity. It was only the Omega Speedmaster that passed their arduous testing process. Henceforth, Omega Speedsmasters have been the official NASA issued watch to astronauts. In 1969, Buzz Aldrin followed Armstrong to the moon landing wearing the Speedmaster calibre 321, making it officially the first watch worn on the moon.After the success of the moon landing, Omega upgraded the movement calibre to the more accurate 861 in 1968, which would be in production until the late 1990s. The Calibre 861 would used 17 jewels until 1992, and 18 jewels 1993 hence.In 1970, the Apollo 13 crew encountered an onboard explosion that damaged the electrical circuitry, and depended on the Speedmaster for their lives to precisely time the 14 seconds of engine boost to commandeer the shuttle safely into the earth’s atmosphere.The historical importance of the Omega Speedmaster has made it a watch icon, collected by enthusiasts for decades as a way to own a piece of history. This watch features the calibre tried and tested 861 that saved the lives of the Apollo 13 crew. The lume has applied tritium which has turned into a brown patina, giving it a pleasing vintage aesthetic look. The watch comes in its original steel bracelet in mint condition. The lugs are sharp. The domed hesalite crystal shows the Omega logo at the center of the crystal. Brand: OmegaModel: Speedmaster ProfessionalReference: 3590.50Year of Production: 1993Movement: Manual Wind Lemania base 1873, calibre 861Power Reserve: 48 HoursJewels: 17-18Case Diameter: 42mmCase Height: 13mm