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From the American Horology Archive:
Rockford Watch Co.

Grade: 405

Model "1903"

Manufacturer: Rockford ?
Manufacturer Location: Rockford, Illinois ?
Movement Serial Number: 763530 ?
Grade: 405 ?
Model: 5 ?
Estimated Production Year: 1908 ?
Run Quantity: 1,000 ?
Grade/Model Run: 5 of 6 ?
Grade/Model Total Production: 4,700 ?
Size: 16s ?
Jewels: 17j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Finish Pattern: Fishscale ?
Movement Signing Style: Block Letter ?
Movement Inlay Color: Gilt ?
Movement Setting: Lever ?
Plate: Bridge Plate ?
Double Roller: Yes ?
Center Wheel Material: Gold ?
Regulator: Micrometer ?
Standard Dial Type: Double-Sunk ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 5 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: Yes ?
Movement Markings: Rockford Watch Co. Winnebago 17 Jewels Adjusted 5 Positions Double Roller ?
Case: Various ?
Run ID: 1108.405G5.16S293.165M52.O429.L784.17J391 ?
Data Research: 1907 Rockford Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 24 (2.40%) ?
$ Estimated Value (12 Month Change): +18.15% Analyzing 68 Sales ?