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From the American Horology Archive:
Illinois Watch Co.

Grade: Bunn Special

False Center Bridge

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3895779 ?
Grade: Bunn Special ?
Variation: RY.B.TempAnd ?
Model: 9 ?
Estimated Production Year: 1921 ?
Run Quantity: 2,400 ?
Grade/Model Run: 111 of 195 ?
Grade/Model Total Production: 169,840 ?
Variant Est. Production: 165,100 (16S-M9-21J) ?
Size: 16s ?
Jewels: 21j ?
Jewel Material: Ruby ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Finish Pattern: Ray ?
Movement Setting: Lever ?
Plate: 3/4 Plate ?
Double Roller: Yes ?
Barrel: Going ?
Regulator: Reed ?
Hairspring: Breguet ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 6 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 17.5, 39.0, 58.0 ?
Case Screw Locations: 3.0, 38.0 ?
Movement Markings: Bunn Special Illinois Watch Co. Springfield 21 Jewels Adjusted Temp. And Six Positions Double Roller ?
Case: Various ?
Run ID: 11232.G458.16S3568.169M534.O6020.L6754.21J1135 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 36 (1.50%) ?
$ Estimated Value (12 Month Change): +3.79% Analyzing 6,630 Sales ?