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From the American Horology Archive:
Illinois Watch Co.

Grade: Sangamo

Getty Model

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 2334743 ?
Grade: Sangamo ?
Model: 5 ?
Estimated Production Year: 1911 ?
Run Quantity: 600 ?
Grade/Model Run: 93 of 111 ?
Grade/Model Total Production: 26,135 ?
Variant Est. Production: 15,005 (16S-M5-21J-N) ?
Size: 16s ?
Jewels: 21j ?
Jewel Material: Ruby ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Finish Pattern: Bright Spotted ?
Movement Setting: Lever ?
Plate: 3/4 Plate ?
Double Roller: Yes ?
Barrel: Going ?
Train Material: Gold ?
Center Wheel Material: Gold ?
Regulator: Micrometric ?
Standard Dial Type: Double-Sunk ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 6 ?
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 ?
Movement Markings: Sangamo Illinois Watch Co. Springfield Adjusted [Some Marked "Temperature 6 Positions Isochronism"] [Some Marked "Safety Pinion"] [Some Marked "Double Roller"] [21, 23, or 25] Ruby Jewels ?
Case: Various ?
Run ID: 7272.G144.16S1958.165M804.O3129.L5582.21J459 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 11 (1.83%) ?
$ Estimated Value (12 Month Change): -0.53% Analyzing 638 Sales ?