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From the American Horology Archive:
Rockford Watch Co.

Grade: 9 Jewels

Jeweled 3rd and 4th Upper

Manufacturer: Rockford ?
Manufacturer Location: Rockford, Illinois ?
Movement Serial Number: 64663 ?
Grade: 9 Jewels ?
Model: 1 ?
Estimated Production Year: 1878 ?
Run Quantity: 1,000 ?
Grade/Model Run: 5 of 8 ?
Grade/Model Total Production: 7,950 ?
Variant Est. Production: 6,950 (18S-M1-K) ?
Size: 18s ?
Jewels: 9j ?
Jewel Setting: Friction ?
Movement Configuration: Adaptable ?
Movement Finish: Gilt ?
Movement Signing Style: Serif (Decorative) ?
Movement Inlay Color: None ?
Movement Setting: Key ?
Wind Mechanism: Key ?
Plate: Full Plate ?
Regulator: Plain ?
Hairspring: Flat ?
Railroad Grade: No ?
Movement Markings: Rockford Watch Co. Rockford, Ill. Pat. Pinion ?
Case: Various ?
Run ID: 91.G5.18S91.181M74.E73.K72.9J33 ?
Data Research: 1907 Rockford Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 8 (0.80%) ?