Gruen 275 Movement Specifications, Beat Rate & Dimensions

Technical Caliber Datasheet

Manufacturer	Gruen
Caliber Reference	Gruen 275
Movement Type	Manual
Diameter (Lignes)	—
Diameter (mm)	12.5 mm
Height / Thickness	3.5 mm
Jewel Count	17 Jewels
Beat Rate / Frequency	18,000 BPH
Lift Angle	51°
Power Reserve	38 hours
Escapement	Swiss Lever
Production Period	1947

Historical Reference & Restoration Notes

The Gruen 275 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.