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From the American Horology Archive:
Illinois Watch Co.

Grade: 606

Mixed Run: 19-Jewel and 21-Jewel Examples Reported

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3980791 ?
Grade: 606 ?
Model: 7 ?
Estimated Production Year: 1922 ?
Run Quantity: 900 ?
Grade/Model Run: 8 of 34 ?
Grade/Model Total Production: 10,810 ?
Variant Est. Production: 2,120 (16S-M7-19J-O-N) ?
Size: 16s ?
Jewels: 19j Mixed Run ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: 3/4 Plate ?
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: 11324.606G43.16S3619.167M629.O6106.P3988.19J623 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 16 (1.78%) ?
$ Estimated Value (12 Month Change): -11.54% Analyzing 166 Sales ?