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From the American Horology Archive:
Illinois Watch Co.

Grade: 525

Extra Thin.

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 4872667 ?
Grade: 525 ?
Model: 3XT ?
Estimated Production Year: 1927 ?
Run Quantity: 1,000 ?
Grade/Model Run: 7 of 34 ?
Grade/Model Total Production: 33,750 ?
Variant Est. Production: 33,700 (12S-M3XT-N) ?
Size: 12s ?
Jewels: 17j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: 3/4 Plate ?
Barrel: Motor ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 3 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: No ?
Dial Feet Locations: None ?
Case Screw Locations: 5.0, 35.0 ?
Case: Various ?
Run ID: 12131.525G24.12S2031.M41.O6864.P4545.17J4055 ?
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): 0.00% Analyzing 270 Sales ?