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From the American Horology Archive:
Illinois Watch Co.

Grade: Miller

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 26796 ?
Grade: Miller ?
Model: 1 ?
Class: 3 ?
Estimated Production Year: 1874 ?
Run Quantity: 1,000 ?
Grade/Model Run: 13 of 18 ?
Grade/Model Total Production: 12,200 ?
Variant Est. Production: 7,600 (18S-M1-ADJ) ?
Size: 18s ?
Jewels: 15j ?
Jewel Setting: Scribed ?
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 ?
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: O-36.5, H-51.5 ?
Movement Markings: Miller Springfield, Ill. Patent Pinion [Some Marked "Adjusted"] ?
Case: Various ?
Run ID: 33.G7.18S33.181M33.A33.K33.15J11 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 10 (1.00%) ?