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From the American Horology Archive:
American Waltham Watch Co.

Grade: W.W.Co.

["Style A","Style B","Style C","Style D Chronodrometer","Style E"]

Manufacturer: Waltham ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 348155 ?
Grade: W.W.Co. ?
Model: 1857 ?
Estimated Production Year: 1869 ?
Run Quantity: 990 ?
Grade/Model Run: 21 of 237 ?
Grade/Model Total Production: 61,522 ?
Variant Est. Production: 42,638 (18S-M1857-15J-OGK-ADJ) ?
Size: 18s ?
Jewels: 15j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Openface ?
Movement Finish: Gilt ?
Movement Setting: Key ?
Wind Mechanism: Key ?
Plate: Full Plate ?
Regulator: Plain ?
Hairspring: Flat ?
Adjusted: Yes ?
Case: Various ?
Run ID: 3942.G21.18S3688.181857M3485.O3938.K3941.15J932 ?
Data Research: c.1900 Waltham Factory Ledger Book 1 [NAWCC]
c.1900 Waltham Factory Ledgers [Ehrhardt Transcription]
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: 17 (1.72%) ?
$ Estimated Value (12 Month Change): -16.87% Analyzing 638 Sales ?