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From the American Horology Archive:
Illinois Watch Co.

Grade: 806

Custom Split Bridge

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3377331 ?
Grade: 806 ?
Variation: WWCo ?
Model: 9 ?
Estimated Production Year: 1918 ?
Run Quantity: 50 ?
Grade/Model Run: 51 of 63 ?
Grade/Model Total Production: 43,510 ?
Variant Est. Production: 37,860 (16S-M9-21J-L-N) ?
Size: 16s ?
Jewels: 21j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Lever ?
Plate: 3/4 Plate ?
Double Roller: Yes ?
Barrel: Going ?
Adjusted: Yes ?
Adjusted # of Positions: 5 ?
Adjusted to Temperature: Yes ?
Dial Feet Locations: 17.5, 39.0, 58.0 ?
Case Screw Locations: 3.0, 38.0 ?
Case: Various ?
Run ID: 10363.806G37.16S3135.169M346.O5315.L6467.21J911 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 2 (4.00%) ?
$ Estimated Value (12 Month Change): -2.50% Analyzing 671 Sales ?