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From the American Horology Archive:
Illinois Watch Co.

Grade: Stuart

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 51988 ?
Grade: Stuart ?
Model: 3 ?
Estimated Production Year: 1880 ?
Run Quantity: 50 ?
Grade/Model Run: 3 of 13 ?
Grade/Model Total Production: 1,200 ?
Size: 18s ?
Jewels: 17j ?
Movement Configuration: Openface ?
Movement Finish: Gilt ?
Movement Setting: Lever ?
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: 1.5, 21.5, 38.0 ?
Case Screw Locations: 23.5, 51.5 ?
Movement Markings: Stuart. Springfield, Ill. Patent Pinion ["Wheelers Pat.6.22.80" on Movements with Micrometric Regulators] ?
Case: Various ?
Run ID: 94.G10.18S94.183M8.O9.L27.17J6 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 2 (4.00%) ?