Pocket Watch Database
https://pocketwatchdatabase.com/search/result/hamilton/5278
Access Date: May 09, 2025
"5278" could possibly indicate the grade of the watch and not the serial number of your movement. Serial numbers are usually more than a few digits.
From the American Horology Archive:

Hamilton Watch Co.
Grade: 926
Manufacturer: | Hamilton |
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Manufacturer Location: | Lancaster, Pennsylvania |
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Movement Serial Number: | 5278 |
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Grade: | 926 |
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Model: | 1 |
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Class: | 3 |
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Estimated Production Year: | Login to View |
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Run Quantity: | Login to View |
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Grade/Model Run: | Login to View |
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Grade/Model Total Production: | Login to View |
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Size: | 18s |
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Jewels: | 17j |
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Jewel Setting: | Login to View |
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Movement Configuration: | Openface |
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Movement Finish: | Nickel |
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Movement Setting: | Lever |
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Plate: | Full Plate |
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Regulator: | Login to View |
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Hairspring: | Login to View |
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Standard Dial Type: | Login to View |
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Adjusted: | Login to View |
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Adjusted to Position: | Login to View |
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Adjusted to Temperature: | Login to View |
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Adjusted to Isochronism: | Login to View |
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Railroad Grade: | Login to View |
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Dial Feet Locations: | Login to View |
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Case: | Various | ![]() |
Run ID: | 21.926G1.18S21.181M9.O9.L21.17J11 | ![]() |
Data Research: |
1953 Hamilton Serial List |
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Database Version: | v52.645 | ![]() |
Advanced Metrics | ||
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Registry Population: Scoped for This Run Only | 1 (0.33%) | ![]() |
$ Estimated Value (12 Month Change): | -7.26% Analyzing 684 Sales | ![]() |
14 Additional Member-Only Data Points Available
The following information is unlocked with a free account:
Estimated Production Year, Run Quantity, Grade/Model Run, Grade/Model Total Production, Jewel Setting, Regulator Type, Hairspring, Standard Dial Type, Adjustments, Adjusted to Position, Temperature Adjustments, Isochronism Adjustments, Railroad Grade Designation, Dial Feet Locations
Population Registry for This Run
Image | Serial Number | Run Position | Primary Identification Method | Discovery Date | |
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There is 1 watch in the population registry for this run with 1 image.
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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.
2mnyboxers Supporter 410 · September 30, 2023
Serial Number 5153 was reported as accurate.
tturner770 18 · August 18, 2020
Serial Number 5278 was reported as accurate.
Gimparoo Supporter 703 · February 11, 2017
Serial Number 5388 was reported as accurate.

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