Rolex 630

Last updated: August 4, 2025

Brand

Rolex

Caliber Number

630

Production Period

1945 – 1949

Lignes

10 ½”’

Diameter

23.7 mm

Height

Thick (necessitated “Bubbleback” case)

Power Reserve

Unconfirmed

Frequency

18,000 bph (2.5 Hz)

Jewels

17 or 18

Escapement

Swiss Lever Escapement

Anti-Shock Device

Variable / Optional for the era

Hand Count

3 (Hours, Minutes, Sweep Seconds)

Manufacture Region

Unconfirmed

Functions

Automatic Winding, Sweep Seconds, Chronometer

Rolex 630 Description

The Rolex Caliber 630 is an early self-winding movement from the “Bubbleback” era of the late 1940s. As a chronometer-grade caliber, it powered a variety of Oyster Perpetual models. Its thickness, due to the automatic winding mechanism, necessitated the domed “Bubbleback” or “Ovettone” case design. The 630 was a key time-only movement in the evolution of Rolex’s famed “Perpetual” line, representing the state-of-the-art for its time.