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From the American Horology Archive:
Illinois Watch Co.

Grade: 107

False Center Bridge

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3155406 ?
Grade: 107 ?
Model: 9 ?
Class: 1 ?
Estimated Production Year: 1917 ?
Run Quantity: 900 ?
Grade/Model Run: 44 of 71 ?
Grade/Model Total Production: 88,000 ?
Size: 16s ?
Jewels: 21j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Lever ?
Plate: Bridge Plate ?
Bridge Type: False Center ?
Double Roller: Yes ?
Barrel: Going ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted to Temperature: Yes ?
Dial Feet Locations: 17.5, 39.0, 58.0 ?
Case Screw Locations: 3.0, 38.0 ?
Case: Various ?
Run ID: 9861.107G25.16S2939.169M277.O4911.L6347.21J803 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 10 (1.11%) ?
$ Estimated Value (12 Month Change): +0.52% Analyzing 597 Sales ?