Illinois 401 Movement Specifications, Beat Rate & Dimensions

Technical Caliber Datasheet

Manufacturer	Illinois
Caliber Reference	Illinois 401
Movement Type	Manual
Diameter (Lignes)	—
Diameter (mm)	39.75 mm
Height / Thickness	5.1 mm
Jewel Count	11 Jewels
Beat Rate / Frequency	18,000 BPH
Lift Angle	51°
Power Reserve	38 hours
Escapement	Swiss Lever
Production Period	1904

Historical Reference & Restoration Notes

The Illinois 401 is a celebrated example of vintage precision engineering. Featuring 11 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 official catalog.