Omega Speedmaster Professional vintage chronograph wrist watch, probably ca. 1970s or 1980s. This watch is referred to by collectors as the “Moon Watch” because this model watch was worn by the astronauts on the first moon mission. This watch features a solid stainless steel screwback case with a fixed tachymetre bezel, a matching stainless steel bracelet, a calibre #861 manual-wind chronograph movement with 60-second, 30-minute,and 12-hour recording functions, and a black dial with luminous hands and hour markers. Excellent condition overall, runs well. Size: 41mm diameter. The bracelet will fit wrists up to 7-3/4″ and can be made smaller by adjusting the clasp or removing links. A super clean, highly collectible watch that is ready to wear.