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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.