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Small Waltham Pocket Watch Conversion 7 Jewels Grade 310 (Not Working)
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Information Provided by PocketWatchDatabase.com:
https://pocketwatchdatabase.com/search/result/waltham/18331256
Access Date: April 17, 2025
From the American Horology Archive:
American Waltham Watch Co.

Grade: No. 310

Manufacturer: Waltham Question Mark
Manufacturer Location: Waltham, Massachusetts Question Mark
Movement Serial Number: 18331256 Question Mark
Grade: No. 310 Question Mark
Model: 1900 Question Mark
Estimated Production Year: 1912 Question Mark
Run Quantity: 2,000 Question Mark
Grade/Model Run: 1 of 30 Question Mark
Grade/Model Total Production: 109,199 Question Mark
Size: 3/0s Question Mark
Jewels: 7j Question Mark
Movement Configuration: Openface Question Mark
Movement Finish: Nickel Question Mark
Movement Setting: Pendant Question Mark
Plate: 3/4 Plate Question Mark
Hairspring: Breguet Question Mark
Adjusted: No Question Mark
Railroad Grade: No Question Mark
Case: Various Question Mark
Run ID: 21905.G1.S6.M5.O13608.P7128.7J6283 Question Mark
Data Research: 1954 Waltham "Gray Book" List
NAWCC Waltham Serial Digest
 Question Mark
Database Version: v52.636 Question Mark
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration		 330.91 Question Mark
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration		 303.34 Question Mark
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration		 0.327% Question Mark
Registry Population:
Scoped for This Run Only		5 (0.25%) Question Mark
$ Estimated Value (12 Month Change): -18.42% Analyzing 152 Sales Question Mark
Research Note: Waltham Serial Lists designate this run as Grade "Marsh" (3/0s, Model 1900, 7 Jewels, Openface, "U" Material). However, #18331256 has been reported as a standard Grade No. 310 with a cover marked, "Marsh's Patent Movement Protector - Waltham Watch Company," likely cooresponding to U.S. Patent #788923, issued to Edward A. Marsh on May 2, 1905.
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Population Registry for This Run

Image Serial Number Run Position Primary Identification Method Discovery Date
There are 5 watches in the population registry for this run.
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Verification Reports for this Run

The following reports have been graciously submitted by dedicated members in reference to this production run. These reports are useful to verify data and track inaccuracies that require further research. Please note that reports may contain inaccurate information or assumptions that must be dilligently considered with other available sources.

rtwatches 943 · May 17, 2018

Serial Number 18331256 was reported as inaccurate.

Note: The movement is not marked Marsh, it is basically
a grade 310 fitted with a ring and a hinged cover
marked Marsh's Patent Movement Protector --
Waltham Watch Company.
Curator Response: Thanks for the report. The database has been updated accordingly.