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From the American Horology Archive:
Illinois Watch Co.

Grade: I.W.C.

Standard Watch Company

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 869278 ?
Grade: I.W.C. ?
Model: 1 ?
Class: 7 ?
Estimated Production Year: 1887 ?
Run Quantity: 1,000 ?
Grade/Model Run: 51 of 79 ?
Grade/Model Total Production: 92,300 ?
Size: 18s ?
Jewels: 7j ?
Movement Configuration: Adaptable ?
Movement Finish: Gilt ?
Movement Setting: Key ?
Wind Mechanism: Key ?
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: O-36.5, H-51.5 ?
Movement Markings: I.W.Co. [or "Illinois Watch Co."] Springfield, Ill. Patent Pinion ?
Case: Various ?
Run ID: 1659.G41.18S1429.181M468.A468.K475.7J333 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 4 (0.40%) ?
$ Estimated Value (12 Month Change): +6.19% Analyzing 763 Sales ?
Research Note: Factory Records Indicate Private Labels in Run.