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From the American Horology Archive:
Illinois Watch Co.

Grade: Dean

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 64730 ?
Grade: Dean ?
Model: 1 ?
Estimated Production Year: 1876 ?
Run Quantity: 500 ?
Grade/Model Run: 2 of 2 ?
Grade/Model Total Production: 1,400 ?
Size: 18s ?
Jewels: 15j ?
Jewel Setting: Burnished Jewels ?
Movement Configuration: Adaptable ?
Movement Finish: Gilt ?
Movement Setting: Key ?
Wind Mechanism: Key ?
Plate: Full Plate ?
Barrel: Going ?
Balance Type: Uncut Expansion ?
Train: Coarse ?
Regulator: Plain ?
Hairspring: Flat ?
Standard Dial Type: Single-Sunk ?
Adjusted: No ?
Railroad Grade: No ?
Dial Feet Locations: 16.5, 36.5, 53.0 ?
Case Screw Locations: O-36.5, H-51.5 ?
Movement Markings: Dean Springfield, Ill. Patent Pinion ?
Case: Various ?
Run ID: 147.G2.18S147.181M81.A81.K81.15J47 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 9 (1.80%) ?
Research Note: #64698 (Originally Serial #61698): Verified as Marked "Stuart" and "Adjusted" on top plate with Wheeler's patent regulator. Center wheel jeweled. The "1" in the serial number has been changed to a "4." The original serial number (#61698) correctly corresponds to a run of Stuart movements. #64985: Verified as marked "Springfield Watch Co." with burninshed jewels.