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To give an example, a typical Oxford speaker from the ’60s will look something like: 465-217.465 designating the Oxford EIA code, 2 designating the year 1962, and 17 designating the 17th week of ’62.
The EIA code will consist of 3 numbers followed by a date code of 3 or 4 numbers designating the year and the week.The last two digits refer to the week of the year (i.e., a “26” would mean the 26th week or, roughly, June).For example, EIA 606-4-21 would denote the 21st week of 1964.Please note that it’s quite difficult to precisely determine the production date of early Fender amps.
Although the dates derived using the charts below will likely be a good approximation, they should not be considered exact.
While dating Fender amps made before 1994 by serial number is all but impossible (as records of these numbers were never kept), all hope is not lost—the charts below should prove helpful in dating your Fender amp.