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From the American Horology Archive:
Illinois Watch Co.

Grade: Stuart

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 2852 ?
Grade: Stuart ?
Model: 1 ?
Estimated Production Year: 1876 ?
Run Quantity: 500 ?
Grade/Model Run: 2 of 4 ?
Grade/Model Total Production: 801 ?
Size: 18s ?
Jewels: 15j ?
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 ?
Adjusted: Yes ?
Adjusted to Position: No ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: Yes ?
Dial Feet Locations: 16.5, 36.5, 53.0 ?
Case Screw Locations: O-36.5, H-51.5 ?
Movement Markings: Stuart. Springfield, Ill. Patent Pinion ["Wheelers Pat.6.22.80" on Movements with Micrometric Regulators] ?
Case: Various ?
Run ID: 10.G2.18S10.181M10.A10.K10.15J6 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 8 (1.60%) ?