Omega Seamaster Ploprof
A heavy diving watch for professional divers, with a one-piece case and an orange button that locks the bezel.
The name comes from the French plongeurs professionnels, professional divers. Omega tested the watch in pressure chambers and with Comex divers. The shape was unusual but made the watch very tough.
Materials: Stainless steel, mineral glass; self-winding movement
Manufacture: Made in Biel; the case is milled from a single block of steel.
The orange button that locks the rotating bezel.
The angular case with a guard for the crown.