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From the American Horology Archive:
U.S. Watch Co. (Waltham, Mass)

Grade: 84A

Introduced September 1892

Private Label(s) in Run:
  • Express Train

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Manufacturer: U.S. Watch Co. (Waltham, Mass) ?
Manufacturer Location: Waltham, Massachusetts ?
Movement Serial Number: 104018 ?
Grade: 84A ?
Model: 1892 ?
Estimated Production Year: 1892 ?
Run Quantity: 100 ?
Grade/Model Run: 1 of 1 ?
Grade/Model Total Production: 100 ?
Size: 18s ?
Jewels: 15j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Lever ?
Plate: Full Plate ?
Regulator: Matheson ?
Hairspring: Breguet ?
Standard Dial Type: Double-Sunk ?
Adjusted: Yes ?
Movement Markings: U.S. Watch Co. Waltham, Mass. Adjusted ?
Case: Various ?
Run ID: 166.G1.18S77.181892M5.O47.L122.15J46 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 1 (1.00%) ?
Research Note: #104061: Reported as 15-Jewel, Adjusted, Nickel OF Movement. #104018: Verified with "Express Train" marked on barrel bridge and "Jno. J. McGrane - New York" marked on dial.