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The Encyclopedia of Horology

Serial-number guide

Hamilton Watch Company Serial Numbers

Partially verified

What a Hamilton Watch Company serial number can establish, what it cannot, and how to record a date estimate another researcher could check.

Hamilton Watch Company movement markings

Hamilton Hunter 14k Yellow Gold Pocket Watch – 1886
Hamilton Hunter 14k Yellow Gold Pocket Watch – 1886 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record
Hamilton Hunter 14k Yellow Gold Pocket Watch – 1886
Hamilton Hunter 14k Yellow Gold Pocket Watch – 1886 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record
Hamilton Hunter 14k Yellow Gold Pocket Watch – 1886
Hamilton Hunter 14k Yellow Gold Pocket Watch – 1886 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record

Movement markings — maker name, grade, serial number and jewelling — are the evidence base for any serial-number attribution.

Method

Reading the number, step by step

  1. 1. Find the movement number

    Hamilton case serials are a separate sequence from movement serials and were, for many models, applied by outside case suppliers; do not use a case number to date the movement.

  2. 2. Understand what it encodes

    Hamilton movement serials map to approximate production years via published tables; the grade name/number stamped on the movement identifies the specification family independent of the serial.

  3. 3. Judge how precise the date can be

    Partially verified for the mainstream American pocket-watch and early wristwatch period; military-contract Hamiltons (e.g. wartime deck watches) often carry additional government issue numbers that are a distinct research question from the commercial serial.

  4. 4. Check the records behind the tables

    Hamilton grade and serial information is documented through surviving factory literature and NAWCC-associated research; the Hamilton grade is often as informative as the serial number for identification purposes.

Quick facts

Manufacturer
Hamilton Watch Company
Dating confidence
Estimate only — see notes
Editorial status
Partially verified

Sources & references

  1. Hamilton factory service literature
  2. NAWCC Bulletin, articles on Hamilton grades and production

Where sources disagree, the disagreement is stated rather than resolved silently.

Limits

What the number does not prove

Questions

Frequently asked

Where is the serial number on a Hamilton Watch Company watch?
Hamilton case serials are a separate sequence from movement serials and were, for many models, applied by outside case suppliers; do not use a case number to date the movement.
What do Hamilton Watch Company serial numbers mean?
Hamilton movement serials map to approximate production years via published tables; the grade name/number stamped on the movement identifies the specification family independent of the serial.
How accurate is dating a Hamilton Watch Company watch by serial number?
Partially verified for the mainstream American pocket-watch and early wristwatch period; military-contract Hamiltons (e.g. wartime deck watches) often carry additional government issue numbers that are a distinct research question from the commercial serial.
Where are Hamilton Watch Company production records held?
Hamilton grade and serial information is documented through surviving factory literature and NAWCC-associated research; the Hamilton grade is often as informative as the serial number for identification purposes.

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