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From the American Horology Archive:
Illinois Watch Co.

Grade: I.W.C.

Discontinued c.1895

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 818208 ?
Grade: I.W.C. ?
Model: 2 ?
Class: 7 ?
Estimated Production Year: 1888 ?
Run Quantity: 14,000 ?
Grade/Model Run: 57 of 78 ?
Grade/Model Total Production: 73,700 ?
Variant Est. Production: 72,300 (18S-M2-7J-G) ?
Size: 18s ?
Jewels: 7j ?
Movement Configuration: Hunting ?
Movement Finish: Gilt ?
Movement Setting: Lever ?
Plate: Full Plate ?
Barrel: Going ?
Train: Coarse ?
Regulator: Plain Inboard ?
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: I.W.Co. [or "Illinois Watch Co."] Springfield, Ill. Patent Pinion ?
Case: Various ?
Run ID: 1586.G8.18S1390.182M562.H749.L1122.7J271 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 61 (0.44%) ?