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From the American Horology Archive:
Illinois Watch Co.

Grade: Sangamo Special

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 3353532 ?
Grade: Sangamo Special ?
Variation: False Bridge ?
Model: 10 ?
Estimated Production Year: 1918 ?
Run Quantity: 600 ?
Grade/Model Run: 6 of 9 ?
Grade/Model Total Production: 4,340 ?
Variant Est. Production: 4,340 (16S-M10-23J-ONL-U-FALSE BRIDGE) ?
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: 48-Hr. Motor ?
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: 10311.G35.16S3111.1610M8.O5279.L6455.23J205 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 25 (4.17%) ?