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From the American Horology Archive:
Illinois Watch Co.

Grade: 305

Illinois Central

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 4174478 ?
Grade: 305 ?
Variation: Illinois Central ?
Model: 7 ?
Estimated Production Year: 1923 ?
Run Quantity: 1,000 ?
Grade/Model Run: 114 of 177 ?
Grade/Model Total Production: 150,270 ?
Variant Est. Production: 8,700 (16S-M7-O-T) ?
Size: 16s ?
Jewels: 17j ?
Movement Configuration: Openface ?
Movement Finish: Two-Tone ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: False Center ?
Double Roller: Yes ?
Barrel: Going ?
Adjusted: Yes ?
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: 11520.305G157.16S3697.167M659.O6276.P4144.17J3801 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 7 (0.70%) ?
$ Estimated Value (12 Month Change): +4.81% Analyzing 1,345 Sales ?