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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: 4086015 ?
Grade: 306 ?
Model: 7 ?
Estimated Production Year: 1922 ?
Run Quantity: 1,200 ?
Grade/Model Run: 116 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: 11439.306G151.16S3663.167M646.O6202.P4083.19J654 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 16 (1.33%) ?
$ Estimated Value (12 Month Change): +16.95% Analyzing 435 Sales ?