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Guild Home > Calibers > Illinois > Illinois Bunn Special

Illinois Bunn Special Movement Specifications, Beat Rate & Dimensions

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Technical Caliber Datasheet

ManufacturerIllinois
Caliber ReferenceIllinois Bunn Special
Movement TypeManual
Diameter (Lignes)—
Diameter (mm)—
Height / Thickness6.0 mm
Jewel Count21 Jewels
Beat Rate / Frequency18,000 BPH
Lift Angle51°
Power Reserve38 hours
EscapementSwiss Lever
Production Period1923

Historical Reference & Restoration Notes

The Illinois Bunn Special is a celebrated example of vintage precision engineering. Featuring 21 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 Ranfft movement reference.

Restoration enquiries:
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