Rolex 618

Last updated: July 27, 2025

Brand

Caliber Number

618

Production Period

1930s – 1950s

Lignes

16”’

Diameter

35.7 mm

Height

4.2 mm

Power Reserve

Unconfirmed

Frequency

18,000 A/h (2.5 Hz)

Jewels

15 or 17

Escapement

Swiss Lever

Anti-Shock Device

Generally None

Hand Count

3

Manufacture Region

Unconfirmed

Functions

Manual, Small Seconds

Rolex 618 Description

The Rolex Caliber 618 is a large (16”’) manual-wind movement based on a Cortébert 616 pocket watch ébauche. Rolex modified and finished these calibers to supply exclusively to Panerai for their first military dive watches from the 1930s-50s. Known for its robustness, reliability, and signature small-seconds at 9 o’clock, the Cal. 618 is the legendary engine of the original Panerai “Frogman” watches.

Watches Using The Rolex 618 Caliber

Wristwatch with a black dial, tan numbers, and a brown leather strap with white stitching.
Rolex

Rolex 3646

1938-1944
47mm