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From the American Horology Archive:
American Waltham Watch Co.

Grade: No. 620

Manufacturer: Waltham ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 22540245 ?
Grade: No. 620 ?
Model: 1908 ?
Estimated Production Year: 1919 ?
Run Quantity: 5,000 ?
Grade/Model Run: 166 of 197 ?
Grade/Model Total Production: 354,099 ?
Variant Est. Production: 189,599 (16S-M1908-ONP) ?
Size: 16s ?
Jewels: 15j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Inlay Color: Black ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Regulator: Church 1892 ?
Hairspring: Breguet ?
Adjusted: No ?
Railroad Grade: No ?
Movement Markings: A.W.W.Co. Waltham, Mass. 15 Jewels ?
Case: Various ?
Run ID: 24199.G340.16S3584.161908M1137.O15039.P9216.15J5685 ?
Data Research: 1954 Waltham "Gray Book" List
NAWCC Waltham Serial Digest
?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 35 (0.70%) ?
$ Estimated Value (12 Month Change): +11.46% Analyzing 2,837 Sales ?