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The Encyclopedia of Horology

Serial-number guide

Westclox Serial Numbers

Needs research

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

Diagram

maker or gradeserialcase hallmarksimport and assay marks
Schematic: where markings are found. An outline schematic drawn to show the arrangement of the parts discussed here. It is not a dimensioned working drawing and does not depict a particular maker's calibre.

Method

Reading the number, step by step

  1. 1. Find the movement number

    Movement and case were normally produced together in-house for mass-market products; replacement dials and hands are common and should be checked.

  2. 2. Understand what it encodes

    Some alarm clocks and pocket watches carry stamped codes that collectors interpret as dates, but conventions changed over time and are not universal.

  3. 3. Judge how precise the date can be

    Needs research: combine model identification with any date code, and state which reference interpreted the code.

  4. 4. Check the records behind the tables

    No public factory serial ledger; identification uses model names, dial and case styles, and date codes found on some products, documented by collector references.

Quick facts

Manufacturer
Westclox
Dating confidence
Estimate only — see notes
Editorial status
Needs research

Sources & references

  1. Collector reference works on Westclox clocks and watches (secondary)

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 Westclox watch?
Movement and case were normally produced together in-house for mass-market products; replacement dials and hands are common and should be checked.
What do Westclox serial numbers mean?
Some alarm clocks and pocket watches carry stamped codes that collectors interpret as dates, but conventions changed over time and are not universal.
How accurate is dating a Westclox watch by serial number?
Needs research: combine model identification with any date code, and state which reference interpreted the code.
Where are Westclox production records held?
No public factory serial ledger; identification uses model names, dial and case styles, and date codes found on some products, documented by collector references.

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