Would like to chime in with some spaceflight related info on these special Mark Speedmaster chronographs
In August 1974 we saw the
Omega Speedmaster Mark III at the wrist of cosmonaut Gennadi Sarafanov (Soyuz 15) and in February 1977 at the wrist of cosmonaut Viktor Gorbatko (Soyuz 24)...
Furthermore in April 1979 the Soyuz 33 Commander cosmonaut Nikolai Rukavishnikov wore an
Omega Speedmaster Mark III Big Blue during training for the Soyuz 33 mission...]
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