Dating your martin guitar
If the pot is an original, it indicates a date before which the guitar could not have been built – so it’s always a good idea to have extra reference material around.
Finally, a word of caution: This method applies only to American made pots and not all potentiometer manufacturers subscribed to the EIA source code date.
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If the code does not fit the above criteria, don’t force it and skew your dating results.
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Stamped on every potentiometer (volume and tone pots) is a six- or seven-digit source code that tells who made the pot, as well as the week and the year.
The source dating code is an element of standardization that is administered by the Electronics Industries Alliance (EIA).