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From the American Horology Archive:
American Waltham Watch Co.

Grade: No. 15

Mixed Run

Manufacturer: Waltham ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 4618322 ?
Grade: No. 15 ?
Model: 1883 ?
Estimated Production Year: 1890 ?
Run Quantity: 1,000 ?
Grade/Model Run: 109 of 182 ?
Grade/Model Total Production: 178,500 ?
Variant Est. Production: 10,000 (18S-M1883-15J-OGP-ADJ) ?
Size: 18s ?
Jewels: 15j ?
Movement Configuration: Openface ?
Movement Finish: Gilt ?
Movement Setting: Pendant ?
Plate: Full Plate ?
Regulator: Patent ?
Hairspring: Breguet ?
Adjusted: Yes ?
Case: Various ?
Run ID: 13710.G109.18S9177.181883M1084.O9324.P720.15J3233 ?
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: 9 (0.90%) ?
Research Note: #4618322: Verified with "P.B. Bartlett" marked on barrel bridge.