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From the American Horology Archive:
Illinois Watch Co.

Grade: 2

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 169740 ?
Grade: 2 ?
Model: 1 ?
Class: 5 ?
Estimated Production Year: 1881 ?
Run Quantity: 800 ?
Grade/Model Run: 72 of 86 ?
Grade/Model Total Production: 84,263 ?
Variant Est. Production: 78,763 (18S-M1-G) ?
Size: 18s ?
Jewels: 11j ?
Movement Configuration: Adaptable ?
Movement Finish: Gilt ?
Movement Setting: Key ?
Wind Mechanism: Key ?
Plate: Full Plate ?
Barrel: Going ?
Balance Type: 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 ?
Case: Various ?
Run ID: 474.2G91.18S451.181M215.A215.K222.11J218 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 9 (1.13%) ?