Omega Speedmaster Professional 145.022-76 Stainless steel 42mm case with the original the aluminium tachy bezel insert which is now fading to blue/grey. All original tritium Black stepped dial and hands. Fitted to a 1171 bracelet with 633 end links. Powered by a Omega 861 movement. The watch bares 39920… serial number dating the watch to 1975.