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From the American Horology Archive:
Illinois Watch Co.

Grade: Sangamo Special

False Center Bridge

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 2970022 ?
Grade: Sangamo Special ?
Variation: False Bridge ?
Model: 9 ?
Estimated Production Year: 1916 ?
Run Quantity: 500 ?
Grade/Model Run: 4 of 25 ?
Grade/Model Total Production: 8,070 ?
Variant Est. Production: 3,420 (16S-M9-23J) ?
Size: 16s ?
Jewels: 23j ?
Jewel Material: Ruby & Sapphire ?
Jewel Setting: Raised Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Lever ?
Plate: Bridge Plate ?
Bridge Type: False Center ?
Double Roller: Yes ?
Barrel: Going ?
Train Material: Gold ?
Center Wheel Material: Gold ?
Hairspring: Breguet ?
Pallet Jewel Material: Ruby ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 6 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: Yes ?
Dial Feet Locations: 17.5, 39.0, 58.0 ?
Case Screw Locations: 3.0, 38.0 ?
Case: Various ?
Run ID: 9483.G26.16S2782.169M226.O4633.L6250.23J185 ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 17 (3.40%) ?
$ Estimated Value (12 Month Change): -7.50% Analyzing 648 Sales ?