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From the American Horology Archive:
Illinois Watch Co.

Grade: 5

Movement may alternatively contain 13 jewels.

Private Label(s) in Run:
  • Illinois Watch Case Co. - Chicago, Ill.

What is a Private Label?
Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 731798 ?
Grade: 5 ?
Model: 2 ?
Class: 3 ?
Estimated Production Year: 1890 ?
Run Quantity: 100 ?
Grade/Model Run: 9 of 18 ?
Grade/Model Total Production: 5,380 ?
Variant Est. Production: 100 (18S-M2-G) ?
Size: 18s ?
Jewels: 15j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Hunting ?
Movement Finish: Gilt Damaskeened ?
Movement Signing Style: Serif (Decorative) ?
Movement Inlay Color: None ?
Movement Setting: Lever ?
Plate: Full Plate ?
Barrel: Going ?
Train: Coarse ?
Regulator: Chalmers ?
Standard Dial Type: Single-Sunk ?
Adjusted: Yes ?
Adjusted to Temperature: Yes ?
Railroad Grade: Yes ?
Dial Feet Locations: 16.5, 36.5, 53.0 ?
Case Screw Locations: 23.5, 51.5 ?
Movement Markings: Illinois Watch Co. Springfield, Ill. Adjusted Patent Pinion Chalmers Pat.12.19.82. ?
Case: Various ?
Run ID: 1499.5G27.18S1361.182M537.H666.L1038.15J255 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 3 (3.00%) ?
$ Estimated Value (12 Month Change): +6.29% Analyzing 82 Sales ?
Research Note: Factory Records Indicate Private Labels in Run.