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From the American Horology Archive:
American Waltham Watch Co.

Grade: K

Mixed Run: Lady Waltham, Royal 16-Jewel, and W 11-Jewel Examples in Run

Manufacturer: Waltham ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 6544043 ?
Grade: K ?
Model: 1890 ?
Estimated Production Year: 1900 ?
Run Quantity: 4,000 ?
Grade/Model Run: 7 of 17 ?
Grade/Model Total Production: 23,400 ?
Variant Est. Production: 9,200 (6S-M1890-16J-ADJ) ?
Size: 6s ?
Jewels: 16j Mixed Run ?
Jewel Material: Ruby ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Hunting ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: 3/4 Split Plate ?
Hairspring: Breguet ?
Adjusted: Yes ?
Railroad Grade: No ?
Case: Various ?
Run ID: 14815.G15.6S407.61890M114.H4024.P1484.16J421 ?
Data Research: c.1900 Waltham Factory Ledger Book 2 [NAWCC]
1954 Waltham "Gray Book" List
NAWCC Waltham Serial Digest
?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 32 (0.80%) ?