Illinois 403 Movement Specifications, Beat Rate & Dimensions

Technical Caliber Datasheet

Manufacturer	Illinois
Caliber Reference	Illinois 403
Movement Type	Manual
Diameter (Lignes)	—
Diameter (mm)	39.75 mm
Height / Thickness	5.1 mm
Jewel Count	15 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Historical Reference & Restoration Notes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 403 is a celebrated example of vintage precision engineering. Featuring 15 jewels and operating at 18,000 BPH, surviving examples are prized by collectors and restorers. For further technical reference on vintage watch movements, consult the Fondation Haute Horlogerie reference.