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From the American Horology Archive:
American Waltham Watch Co.

Grade: No. 645

Manufacturer: Waltham ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 19108398 ?
Grade: No. 645 ?
Model: 1908 ?
Estimated Production Year: 1913 ?
Run Quantity: 500 ?
Grade/Model Run: 63 of 66 ?
Grade/Model Total Production: 59,300 ?
Variant Est. Production: 57,300 (16S-M1908) ?
Size: 16s ?
Jewels: 21j ?
Jewel Material: Ruby ?
Jewel Setting: Screw-Set ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Lever ?
Plate: Bridge Plate ?
Double Roller: Yes ?
Barrel: Jeweled Motor ?
Regulator: Micrometer ?
Hairspring: Breguet ?
Pallet Jewel Material: Sapphire ?
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 ?
Case: Various ?
Run ID: 22373.G36.16S3000.161908M570.O13886.L5373.21J437 ?
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: 8 (1.60%) ?
$ Estimated Value (12 Month Change): +3.61% Analyzing 775 Sales ?