Omega · Automatic

1152

Omega's execution of the ETA/Valjoux 7750, fitted to the Speedmaster Date through the 1990s and 2000s. It differs from the Speedmaster Reduced's calibre 1140 in construction rather than specification: the 1140 stacks a Dubois-Dépraz chronograph module onto a time-only base, while the 1152 is an integrated chronograph whose timing works belong to the movement's own architecture. That is what gives it a twelve-hour counter.