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Guild Home > Calibers > Benrus > Benrus BB4

Benrus BB4 Movement Specifications, Beat Rate & Dimensions

BENRUS • Benrus BB4 DIAMETER: 26.0 mm | JEWELS: 17 Jewels | FREQ: 18,000 BPH ARCHIVE SPEC
Original Horological Blueprint • Benrus Benrus BB4 Architecture

Technical Caliber Datasheet

ManufacturerBenrus
Caliber ReferenceBenrus BB4
Movement TypeManual
Diameter (Lignes)—
Diameter (mm)26.0 mm
Height / Thickness3.5 mm
Jewel Count17 Jewels
Beat Rate / Frequency18,000 BPH
Lift Angle51°
Power Reserve38 hours
EscapementSwiss Lever
Production Period1950

Historical Reference & Restoration Notes

The Benrus BB4 is a celebrated example of vintage precision engineering. Featuring 17 jewels and operating at 18,000 BPH, surviving examples are prized by collectors and restorers. For authentic restored timepieces and bespoke pocket-to-wrist conversions, visit explore collection.

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