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From the American Horology Archive:
American Waltham Watch Co.

Grade: No. 160

(Alternatively Grade No. 161)

Manufacturer: Waltham ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 16610535 ?
Grade: No. 160 ?
Model: 1907 ?
Estimated Production Year: 1908 ?
Run Quantity: 6,000 ?
Grade/Model Run: 34 of 46 ?
Grade/Model Total Production: 121,300 ?
Size: 0s ?
Jewels: 7j ?
Movement Configuration: Hunting ?
Movement Setting: Pendant ?
Hairspring: Breguet ?
Adjusted: No ?
Railroad Grade: No ?
Case: Various ?
Run ID: 20819.G11.0S794.01907M61.H6891.P6190.7J5999 ?
Data Research: 1954 Waltham "Gray Book" List
NAWCC Waltham Serial Digest
?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 15 (0.25%) ?