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From the American Horology Archive:
Illinois Watch Co.

Grade: 304

False Center Bridge

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3000803 ?
Grade: 304 ?
Model: 7 ?
Estimated Production Year: 1916 ?
Run Quantity: 1,000 ?
Grade/Model Run: 81 of 122 ?
Grade/Model Total Production: 69,100 ?
Variant Est. Production: 60,540 (16S-M7-17J-O-N) ?
Size: 16s ?
Jewels: 17j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: False Center ?
Double Roller: Yes ?
Barrel: Going ?
Adjusted: No ?
Railroad Grade: No ?
Dial Feet Locations: 17.5, 39.0, 58.0 ?
Case Screw Locations: 3.0, 38.0 ?
Case: Various ?
Run ID: 9528.304G120.16S2803.167M341.O4666.P2719.17J2970 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 7 (0.70%) ?
$ Estimated Value (12 Month Change): +3.57% Analyzing 792 Sales ?