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From the American Horology Archive:
Illinois Watch Co.

Grade: 306

False Center Bridge

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3722612 ?
Grade: 306 ?
Model: 7 ?
Estimated Production Year: 1920 ?
Run Quantity: 1,200 ?
Grade/Model Run: 93 of 123 ?
Grade/Model Total Production: 37,900 ?
Variant Est. Production: 26,660 (16S-M7-19J-O-N) ?
Size: 16s ?
Jewels: 19j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: False Center ?
Double Roller: Yes ?
Barrel: Going ?
Adjusted: Yes ?
Adjusted # of Positions: 3 ?
Adjusted to Temperature: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 17.5, 39.0, 58.0 ?
Case Screw Locations: 3.0, 38.0 ?
Case: Various ?
Run ID: 11007.306G125.16S3455.167M575.O5841.P3768.19J548 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 11 (0.92%) ?
$ Estimated Value (12 Month Change): +16.95% Analyzing 435 Sales ?