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From the American Horology Archive:
Illinois Watch Co.

Grade: 606

False Center Bridge

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 4241037 ?
Grade: 606 ?
Model: 7 ?
Estimated Production Year: 1923 ?
Run Quantity: 100 ?
Grade/Model Run: 13 of 34 ?
Grade/Model Total Production: 10,810 ?
Variant Est. Production: 7,090 (16S-M7-21J-O-N) ?
Size: 16s ?
Jewels: 21j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: 3/4 Plate ?
Double Roller: Yes ?
Barrel: Going ?
Adjusted: Yes ?
Adjusted # of Positions: 3 ?
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: 11573.606G54.16S3720.167M666.O6326.P4181.21J1219 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 2 (2.00%) ?