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From the American Horology Archive:
Illinois Watch Co.

Grade: Miller

Mixed Run: Model 2 (15-Jewel) and Model 3 (17-Jewel) Movements

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 54643 ?
Grade: Miller ?
Model: 2 ?
Class: 3 ?
Estimated Production Year: 1879 ?
Run Quantity: 1,000 ?
Grade/Model Run: 24 of 24 ?
Grade/Model Total Production: 5,900 ?
Size: 18s ?
Jewels: 15j Mixed Run ?
Jewel Setting: Scribed ?
Movement Configuration: Hunting ?
Movement Finish: Gilt ?
Movement Setting: Lever ?
Plate: Full Plate ?
Barrel: Going ?
Balance Type: Expansion ?
Train: Coarse ?
Regulator: Plain ?
Hairspring: Flat ?
Standard Dial Type: Single-Sunk ?
Adjusted: Yes ?
Adjusted to Temperature: Yes ?
Railroad Grade: Yes ?
Dial Feet Locations: 16.5, 36.5, 53.0 ?
Case Screw Locations: 23.5, 51.5 ?
Movement Markings: Miller Springfield, Ill. Patent Pinion [Some Marked "Adjusted"] ?
Case: Various ?
Run ID: 98.G12.18S98.182M21.H20.L29.15J27 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 7 (0.70%) ?
$ Estimated Value (12 Month Change): -5.21% Analyzing 215 Sales ?