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From the American Horology Archive:
Illinois Watch Co.

Grade: 187

Getty Model

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 2487290 ?
Grade: 187 ?
Model: 5 ?
Estimated Production Year: 1912 ?
Run Quantity: 500 ?
Grade/Model Run: 16 of 16 ?
Grade/Model Total Production: 3,750 ?
Size: 16s ?
Jewels: 17j ?
Jewel Material: Ruby ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Signing Style: Block Letter ?
Movement Inlay Color: Black ?
Movement Setting: Lever ?
Plate: 3/4 Bridge Plate ?
Bridge Type: Train ?
Double Roller: Yes ?
Barrel: Going ?
Regulator: Reed ?
Adjusted: Yes ?
Adjusted # of Positions: 5 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: Yes ?
Dial Feet Locations: 24.5, 36.5, 55.5 ?
Case Screw Locations: 3.5, 37.5 ?
Case: Various ?
Run ID: 7844.187G29.16S2170.165M855.O3490.L5782.17J2272 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 18 (3.60%) ?