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From the American Horology Archive:
Rockford Watch Co.

Grade: 15 Jewels

Original data is missing for this range. Please report information about your watch movement, if known.

Manufacturer: Rockford ?
Manufacturer Location: Rockford, Illinois ?
Movement Serial Number: 57263 ?
Grade: 15 Jewels ?
Model: 1 ?
Estimated Production Year: 1878 ?
Run Quantity: 1,000 ?
Grade/Model Run: 5 of 6 ?
Grade/Model Total Production: 4,450 ?
Variant Est. Production: 4,250 (18S-M1) ?
Size: 18s ?
Jewels: 15j ?
Jewel Setting: Pressed/Friction Settings ?
Movement Configuration: Adaptable ?
Movement Finish: Gilt ?
Movement Signing Style: Block Letter ?
Movement Inlay Color: None ?
Movement Setting: Key ?
Wind Mechanism: Key ?
Plate: Full Plate ?
Adjusted: No ?
Railroad Grade: No ?
Movement Markings: Rockford Watch Co. Rockford, Ill. Pat. Pinion ?
Case: Various ?
Run ID: 81.G5.18S81.181M65.E64.K64.15J26 ?
Data Research: 1907 Rockford Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 6 (0.60%) ?