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From the American Horology Archive:
Illinois Watch Co.

Grade: 503

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3144064 ?
Grade: 503 ?
Model: 4 ?
Estimated Production Year: 1917 ?
Run Quantity: 500 ?
Grade/Model Run: 6 of 11 ?
Grade/Model Total Production: 3,610 ?
Variant Est. Production: 3,310 (12/14S-M4-15J) ?
Size: 12/14s ?
Jewels: 15j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: Center ?
Barrel: Going ?
Adjusted: No ?
Railroad Grade: No ?
Dial Feet Locations: 20.5, 39.0, 55.0 ?
Case Screw Locations: 2.5, 35.5 ?
Case: Various ?
Run ID: 9823.503G8.S59.M59.O4879.P2944.15J2115 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 2 (0.40%) ?