Omega Speedmaster Mark IV.5 Ref. 176.0012 circa 1978 - YouTube
Omega Speedmaster Mark 4.5 Ref. 176.0012 – Watchworks
Omega Speedmaster Mark 4.5 chronograph automatic gentleman's bracelet watch, ref. 176.0012, circa 1982, serial no. 4554xxxx, tachymeter bezel, black dial with luminous baton markers, chronograph centre seconds, day/dates apertures with triple subsidiary
OMEGA SPEEDMASTER REF. 176.0012 MARK 4.5 - Romain Réa