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From the American Horology Archive:
Illinois Watch Co.

Grade: 903

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3942277 ?
Grade: 903 ?
Model: 2 ?
Estimated Production Year: 1921 ?
Run Quantity: 1,000 ?
Grade/Model Run: 71 of 171 ?
Grade/Model Total Production: 167,620 ?
Variant Est. Production: 160,370 (6/0S-M2-15J-O) ?
Size: 6/0s ?
Jewels: 15j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: False Center ?
Barrel: Going ?
Railroad Grade: No ?
Dial Feet Locations: 2.5, 21.0, 43.5 ?
Case Screw Locations: 4.0, 35.0 ?
Case: Various ?
Run ID: 11283.903G71.S109.M72.O6066.P3961.15J2296 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 5 (0.50%) ?
$ Estimated Value (12 Month Change): 0.00% Analyzing 126 Sales ?