Ref. 311.30.42.30.01.005

Speedmaster Professional Moonwatch

Omega

“Moonwatch Sapphire”

This Speedmaster Professional reference featured the calibre 1861 with a sapphire caseback, allowing a view of the hand-wound movement through the rear crystal. It was produced alongside the Hesalite-only 3570.50.00 and offered collectors a choice between traditional Hesalite and the display-back sapphire configuration. This reference bridges the gap between the classic Moonwatch and the modern Master Chronometer era.