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From the American Horology Archive:
American Waltham Watch Co.

Grade: Waltham Standard

Manufacturer: Waltham ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 10099565 ?
Grade: Waltham Standard ?
Model: 1892 ?
Estimated Production Year: 1900 ?
Run Quantity: 125 ?
Grade/Model Run: 1 of 1 ?
Grade/Model Total Production: 125 ?
Size: 18s ?
Jewels: 19j ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Lever ?
Plate: Full Plate ?
Regulator: Church 1892 ?
Hairspring: Breguet ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Case: Various ?
Run ID: 16840.G1.18S10447.181892M172.O10839.L4311.19J79 ?
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: 6 (4.80%) ?
Research Note: Factory Serial Lists designate this run as grade "Special." However, all surviving examples logged from this run have been marked "Waltham Standard" and feature a locomotive engraving. To the best of our knowledge, this is the only run on movements manufactured at the Waltham factory marked in this way. The database has been updated to classify this as a grade for the purposes of production metrics. The estimated total production rests at 125.