30

Introduced in the late 1930s, OMEGA’s “30mm caliber” refers to a major family of manually wound movements built around a diameter of approximately 30mm. Known for their simple, robust construction and excellent serviceability, these movements include the 30T2 and numerous related calibers produced over many years.

Watches fitted with these movements range from small-seconds and center-seconds models to chronometer-certified versions. Often paired with well-proportioned round cases and restrained dial designs, they reflect both the technical quality of the movements themselves and the practical character of OMEGA watchmaking from the 1930s through the 1950s.