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From the American Horology Archive:
Illinois Watch Co.

Grade: Mason

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 4594 ?
Grade: Mason ?
Model: 1 ?
Estimated Production Year: 1873 ?
Run Quantity: 1,000 ?
Grade/Model Run: 3 of 16 ?
Grade/Model Total Production: 10,300 ?
Size: 18s ?
Jewels: 7j ?
Movement Configuration: Adaptable ?
Movement Finish: Gilt ?
Movement Setting: Key ?
Wind Mechanism: Key ?
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: O-36.5, H-51.5 ?
Movement Markings: Mason Springfield, Ill. Patent Pinion ?
Case: Various ?
Run ID: 12.G3.18S12.181M12.A12.K12.7J3 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 5 (0.50%) ?
$ Estimated Value (12 Month Change): -1.20% Analyzing 141 Sales ?