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From the American Horology Archive:
Illinois Watch Co.

Grade: Mason

Discontinued c.1895

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 44645 ?
Grade: Mason ?
Model: 2 ?
Estimated Production Year: 1877 ?
Run Quantity: 100 ?
Grade/Model Run: 1 of 3 ?
Grade/Model Total Production: 300 ?
Size: 18s ?
Jewels: 7j ?
Movement Configuration: Hunting ?
Movement Finish: Gilt ?
Movement Setting: Lever ?
Plate: Full Plate ?
Barrel: Going ?
Balance Type: Uncut Expansion ?
Train: Coarse ?
Regulator: Plain ?
Hairspring: Flat ?
Standard Dial Type: Single-Sunk ?
Adjusted: No ?
Railroad Grade: No ?
Dial Feet Locations: 16.5, 36.5, 53.0 ?
Case Screw Locations: 23.5, 51.5 ?
Movement Markings: Mason Springfield, Ill. Patent Pinion ?
Case: Various ?
Run ID: 56.G16.18S56.182M3.H3.L3.7J22 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 1 (1.00%) ?
$ Estimated Value (12 Month Change): 0.00% Analyzing 141 Sales ?