Many have film processing dates stamped on the back, and one shows a young man and his new Broadcaster, posing with a friend. In addition to a corroded tuning key, the Broadcaster had a broken volume pot, so it didn’t make a sound when plugged into the Fender Deluxe amp A. “If I would have known the guitar was going to last this long, I would’ve taken better care of it!
Here is hypothetical example of the application of the EIA date code to the source code as follows: A company is assigned the source code symbol 134 (which is for the potentiometer manufacturer Centra Lab).
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.
In the second string of numbers, the first three numbers are a code identifying the manufacturer.
The next two numbers after the manufacturer number are the year, and the last two numbers are the week of the year the pots were made.
If the code does not fit the above criteria, don’t force it and skew your dating results.