Omega 30T2 SC

Last updated: July 26, 2025

Brand

Caliber Number

30T2 SC (also Cal. 283)

Production Period

1940 – 1963

Lignes

13.3”’

Diameter

30.0 mm

Height

5.1 mm

Power Reserve

Unconfirmed

Frequency

18,000 bph (2.5 Hz)

Jewels

17

Escapement

Swiss Lever Escapement

Anti-Shock Device

Variable (Incabloc on later models)

Hand Count

3 (Hours, Minutes, Sweep Seconds)

Manufacture Region

Unconfirmed

Functions

Manual Winding, Sweep Seconds

Omega 30T2 SC Description

The Omega 30T2 is a legendary 30mm manual-wind caliber family. The “SC” variant signifies “Seconde Centrale,” a sweep second hand. Introduced in the 1940s, this robust and highly accurate movement was a mainstay in classic Omega timepieces. Its superb design was the basis for many observatory chronometer champions and later evolved into the Cal. 28x series (e.g., Cal. 283), powering Omega watches for over two decades.

Watches Using The Omega 30T2 SC Caliber

A vintage Omega wristwatch with a beige face, black numerals, blue hands, and a tan fabric strap. The watch shows slight wear and patina, indicating age. The Omega logo is visible below the 12 o’clock position.
Omega

Omega CK 2292

1942-1944
33.5mm
A vintage Omega 6B/159 wristwatch with a beige dial, black Arabic numerals, blue hands, and a brown fabric strap, shown against a plain white background.
Omega

Omega 6B/159 1956 Re-Issue

1956
36mm
A vintage Omega 6B/159 1943 Issue wristwatch featuring a round, off-white dial with patina, bold black numerals, and two hands in a silver case, paired with a textured khaki fabric strap. The Omega logo sits below the 12 o’clock position.
Omega

Omega 6B/159 1943 Issue

1943
33mm