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From the American Horology Archive:
Illinois Watch Co.

Grade: 406

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 4333728 ?
Grade: 406 ?
Model: 3 ?
Estimated Production Year: 1923 ?
Run Quantity: 1,000 ?
Grade/Model Run: 108 of 132 ?
Grade/Model Total Production: 98,370 ?
Variant Est. Production: 90,090 (12S-M3-19J-O-N) ?
Size: 12s ?
Jewels: 19j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: Center ?
Barrel: Going ?
Adjusted: Yes ?
Adjusted # of Positions: 3 ?
Adjusted to Temperature: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 20.5, 39.0, 55.0 ?
Case Screw Locations: 2.5, 35.5 ?
Case: Various ?
Run ID: 11651.406G132.12S1797.123M708.O6404.P4230.19J695 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 10 (1.00%) ?
$ Estimated Value (12 Month Change): +17.65% Analyzing 883 Sales ?