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From the American Horology Archive:
Illinois Watch Co.

Grade: 100

Grade 100/105 Hybrid

Manufacturer: Illinois ?
Manufacturer Location: Springfield, Illinois ?
Movement Serial Number: 301634 ?
Grade: 100 ?
Variation: 100+ ?
Model: 1 ?
Estimated Production Year: 1889 ?
Run Quantity: 100 ?
Grade/Model Run: 1 of 1 ?
Grade/Model Total Production: 100 ?
Variant Est. Production: 100 (18S-M1-15J-ANK-U-100+) ?
Size: 18s ?
Jewels: 15j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Adaptable ?
Movement Finish: Nickel ?
Movement Signing Style: Gothic Blackletter ?
Movement Inlay Color: Gilt ?
Movement Setting: Key ?
Wind Mechanism: Key ?
Plate: Full Plate ?
Barrel: Going ?
Train: Coarse ?
Regulator: Chalmers ?
Adjusted: Yes ?
Adjusted to Temperature: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 16.5, 36.5, 53.0 ?
Case Screw Locations: O-36.5, H-51.5 ?
Movement Markings: Illinois Watch Co. Springfield, Ill. Adjusted Safety Pinion Chalmers Pat 12.19.82 ?
Case: Various ?
Run ID: 781.100G10.18S756.181M272.A272.K279.15J87 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 2 (2.00%) ?
Research Note: Factory Records Indicate Private Labels in Run.