Ref. ST 176.0002 was launched in 1971. This watch holds a unique place in the Omega collection of the 1970's. Its case is from the ''Pilot'' line of cases which was used for the ''Flightmaster'', as well as on ''Seamasters'', making it the only ''Speedmaster Professional'' to share its case design with both chronograph and non-chronograph models. It is also the first self-winding Speedmaster Professional? (patent CH 558.556), pre-dating by two years the famous ''Speedy 125'', the movement of which is a certified chronometer version of this caliber. This reference was made with two distinct dial designs, the first black with luminous markers, the second satiné blue with applied indexes. It is interesting that the Omega advertising for the ''Mark III'' states, After six landings on the moon, there was only one thing we could teach the Speedmaster ''to wind itself'' Ironically, had the Speedmaster been self-winding in 1962 it probably would never have passed NASA's stringent tests. This is due to two things: first, self-winding movements do not wind in zero gravity environments; second, these movements tend to be less robust than manual winding ones.