The Omega Speedmaster Professional, widely known as the Moonwatch, remains the only wristwatch qualified by NASA for spacewalks in the vacuum of space, according to historical agency records. Originally launched in 1957 as a purpose-built chronograph for motor racing alongside the Seamaster 300 and Railmaster, the timepiece transitioned from a commercial racing instrument to an essential piece of crewed spaceflight equipment over the course of a decade, according to Omega archives and mission logs.
Origins of the Speedmaster CK2915 and Early References
Omega launched the original Speedmaster CK2915 in 1957 as part of a trilogy of instruments designed for specific professional environments, according to brand historical data. The CK2915 featured a 38.5mm straight-lug case, high-contrast dial, broad arrow hands, and a tachymeter scale engraved directly onto the steel bezel rather than printed on the dial, leaving space for a cleaner layout. The watch relied on the manually wound Caliber 321 movement, based on the Lemania 2310 and conceived by Albert-Gustave Piguet, the technical director of Lemania, according to technical specifications. The CK2915 evolved through three generations before giving way in 1959 to the CK2998, which introduced a black anodized aluminum bezel insert, alpha hands, and a hippocampus caseback medallion, according to Omega documentation.
NASA Qualification Testing and the ST105.003 Reference
Before NASA officially qualified any commercial watch, astronaut Walter “Wally” Schirra wore his personally purchased CK2998 during his mission in October 1962, marking the first time an Omega traveled into space, according to NASA historical accounts. As Project Gemini set the stage for Apollo, Flight Crew Operations Director Deke Slayton issued an internal memo calling for a durable chronograph to back up onboard timing systems, prompting aerospace engineer James Ragan to request submissions from ten watch manufacturers, according to agency records. Hamilton was disqualified immediately for submitting a pocket watch, leaving the Omega Speedmaster ST105.003, Rolex Cosmograph Ref. 6238, and Longines-Wittnauer 235T to undergo testing.
NASA subjected the candidates to severe environmental trials, including temperatures cycling from 70°C to 93°C in a vacuum, 10 days in 95 percent humidity, 40G shocks, and acoustic loading of 130 dB, according to engineering test documentation. In a 2019 interview, Ragan recalled that the thermal vacuum test was the harshest evaluation, noting that the Longines and Rolex candidates failed during the initial test while the Omega survived. On March 1, 1965, NASA officially declared the Speedmaster flight-qualified for all crewed space missions, paving the way for its use on Gemini 3 and Ed White’s spacewalk on Gemini 4 wearing the ST105.003, according to mission schedules.
Apollo Missions and the Caliber 321 Legacy
During the Apollo 11 mission on July 20, 1969, Neil Armstrong left his Speedmaster inside the Lunar Module as a backup timer, leaving Buzz Aldrin to become the first person to wear the watch on the lunar surface, according to NASA logs. Command Module Pilot Michael Collins remained in lunar orbit wearing a reference 145.012 powered by the Caliber 321 movement. The Speedmaster proved critical during the April 1970 Apollo 13 mission following an oxygen tank explosion, when astronauts utilized Command Module Pilot Jack Swigert’s Omega Speedmaster 105.012 to time a 14-second manual engine burn of the Lunar Module descent engine to correct their re-entry trajectory, according to mission reports. In recognition of that contribution, Omega received NASA’s Silver Snoopy Award later that year, according to agency records.
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Frequently Asked Questions
Which watch was the first Omega in space?
The first Omega in space was the personal Speedmaster reference CK2998 worn by astronaut Wally Schirra during the Mercury-Atlas 8 mission in October 1962, according to NASA historical records.
Did Neil Armstrong wear his Speedmaster on the Moon?
No. Neil Armstrong left his Speedmaster inside the Lunar Module during the Apollo 11 moonwalk as a precaution against a faulty electronic timer, leaving Buzz Aldrin as the first person to wear the watch on the lunar surface, according to mission logs.
What tests did NASA put the Speedmaster through?
NASA subjected candidate chronographs to thermal vacuum cycling between 0°F and 160°F, 40G shocks, 95 percent humidity, 16G acceleration, and acoustic loading of 130 dB, according to testing engineer James Ragan.