Omega Speedmaster 331.10.42.51.01.002 42 mm Black Dial

The Speedmaster '57 under 331.10.42.51.01.002 is a 42 mm automatic on Omega Co-Axial Calibre 9300. It belongs with the Speedmaster variants, not the Moonwatch Professional. Omega has discontinued this reference.

Five Saudi listings currently show 331.10.42.51.01.002. Nearby variants 332.10.41.51.01.001 and 332.10.41.51.01.002, and Racing 329.30.44.51.01.002, share the Speedmaster name while the last digits do the real work. Match the full reference on the watch and the papers before treating any listing as this one.