The Omega collection launched in 1957 that includes the Seamaster 300, Railmaster and Speedmaster is the Professional collection.
Omega’s 1957 “Professional” trio was created for demanding environments. The Seamaster 300 targeted divers, the Railmaster was designed around resistance to magnetic fields for railway and technical workers, and the Speedmaster was a chronograph associated with motorsport.
The three watches shared a purposeful, tool-watch identity rather than being dress watches. Their separate histories later became important to Omega’s sporting and professional image, especially after NASA selected the Speedmaster for crewed space missions.
The collection name is sometimes confused with Omega’s other families. Constellation is associated primarily with precision and formal styling, while De Ville developed as a dress-oriented line. “Professional” describes the grouping of specialist models, not one single complication.