Lower Right: The fourth and fifth numbers of this seven-digit potentiometer date code reveal the last two digits of its year of manufacture. Hi Brian, There’s no question that dating Gibson guitars is challenging—and sometimes downright impossible.There are two basic components to your Les Paul question: dating it and identifying it.Quite simply, it is a composite of the number of the week in which the component was made, and the last digit of the year in question: 1-52 (week), plus 0-9 (year ending).
For example, the Pot codes you can make out are: 1377415.
This should never be the only method used, but quite often it can help back up evidence already acquired to date an instrument. First you need to get underneath, to the circular disc on the bottom of the shaft at the opposite end of the knob (which may, or may not, have to be removed depending on the instrument).
In most cases if it’s not made unreadable by blobs of solder, you should see a six or seven digit number.
So, in this case, '340' means the 34th week of 1960 - somewhere towards the end of August.
Interestingly, the other pot is dated '370', which at three weeks later, is mid-September 1960.