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From the American Horology Archive:
Rockford Watch Co.

Grade: 935

Screw-Set Upper Balance Jewel, Hairspring Stud Extension

Manufacturer: Rockford ?
Manufacturer Location: Rockford, Illinois ?
Movement Serial Number: 872059 ?
Grade: 935 ?
Model: 9 ?
Estimated Production Year: 1911 ?
Run Quantity: 1,000 ?
Grade/Model Run: 29 of 61 ?
Grade/Model Total Production: 43,131 ?
Size: 18s ?
Jewels: 17j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Finish Pattern: Tire Tread ?
Movement Setting: Lever ?
Plate: Full Plate ?
Regulator: Reed ?
Movement Markings: R.W.Co. Rockford, Ill. 17 Jewels ?
Case: Various ?
Run ID: 1256.935G59.18S792.189M139.O515.L827.17J483 ?
Data Research: 1907 Rockford Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 14 (1.40%) ?
$ Estimated Value (12 Month Change): +6.54% Analyzing 321 Sales ?