Omega 265

Last updated: August 4, 2025
Close-up of an Omega Swiss watch movement showing gears, screws, and engraved components.

Brand

Caliber Number

265

Production Period

1949 – 1952

Lignes

13.3”’

Diameter

30.0 mm

Height

4.05 mm

Power Reserve

Unconfirmed

Frequency

18,000 bph (2.5 Hz)

Jewels

15

Escapement

Swiss Lever Escapement

Anti-Shock Device

Variable (Incabloc optional)

Hand Count

3 (Hours, Minutes, Sub-Seconds)

Manufacture Region

Unconfirmed

Functions

Manual Winding, Small Seconds

Omega 265 Description

The Omega 265 is a historically significant manual-wind caliber, representing the formal renaming of the original 30T2 small-seconds movement in 1949. As the first of the 26x series, it was most commonly produced with 15 jewels. This robust 30mm workhorse powered a multitude of Omega’s classic dress watches in the early 1950s and is the foundation upon which the later 26x calibers were built.

Watches Using The Omega 265 Caliber

A wristwatch with a brown leather strap, silver case, and a cream and black dial featuring gold Arabic numerals, the Omega logo, and a small seconds subdial at 6 o’clock—this is the classic Omega Seamaster 2937.
Seamaster

Omega Seamaster 2639

1949-1955
36mm