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From the American Horology Archive:
Illinois Watch Co.

Grade: 409

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 2820858 ?
Grade: 409 ?
Model: 3 ?
Estimated Production Year: 1915 ?
Run Quantity: 200 ?
Grade/Model Run: 3 of 6 ?
Grade/Model Total Production: 1,150 ?
Size: 12s ?
Jewels: 21j ?
Jewel Material: Ruby, Sapphire & Diamond ?
Jewel Setting: Raised Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Inlay Color: Gilt ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: Center ?
Double Roller: Yes ?
Barrel: Going ?
Train Material: Gold ?
Center Wheel Material: Gold ?
Regulator: Reed ?
Standard Dial Type: Double-Sunk ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 5 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 20.5, 39.0, 55.0 ?
Case Screw Locations: 2.5, 35.5 ?
Movement Markings: Illinois 21 Jewels Adjusted 5 Positions Double Roller ?
Case: Various ?
Run ID: 8995.409G6.12S838.123M139.O4267.P2287.21J660 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 9 (4.50%) ?