First, it will be useful to you to understand the following five terms in order to choose the correct chart for dating your amp: refers to the two-tone woven fabric that covered many early amplifiers.
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Anything else is at the discretion of the manufacturer.
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In later years, the EIA converted to a 4 digit date code so the year could be easily identified.
There are 2 acceptable methods of displaying the EIA date code, with or without a hyphen between the manufacture code and the year/week code.
In the table below, for example, a “JE” date code indicates a production date of May 1960.
In general, Fender amps that don’t have rubber-stamped tube sticker date codes have EIA numbers on their transformers that might enable determination of the production date.
The Fender serial number decoder currently supports all documented MIA, MIJ, MIM, MIK and MII formats with the exception of Custom Shop, Relic and Reissue instruments.
Please note that fender serial numbers tend to overlap by at least a year, and thereby the date of your guitar can only be approximated.
If you are unable to determine the approximate production year of your amplifier using the above charts, there are other means of dating Fender amps.