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Then 134-6320 would become 134-320 and the specifications of the instrument should be used for determining the approximate year or decade the particular instrument was built.Here is a brief listing of the manufacturers Source Code numbers: 34 – Cornell-Dubilier Electronics (made capacitors used on early Fender Guitars and are the ones that were paper and wax coated.This means that if you don’t have a basic ballpark of the period an instrument was made prior to the 1960’s then Pot codes won’t really help you.For example, the Pot codes you can make out are: 1377415.

If your earlier detective work determined that the guitar was probably made in the early 70’s, you can now ascertain that since you always date an instrument by the latest dated part, that it’s most likely from 1974.

The codes were created by the Electronic Industries Association (EIA) in 1920s to identify the product source and date of manufacture.

The first string of numbers is usually the part number, or sometimes the pot value.

- All vintage USA Big Muffs have source-date codes stamped on the underside of the potentiometer cans, or “pots”.

The pots are what the knobs are mounted to, essentally manually adjustable resisitors that control the voltage across a circuit.