Fender tele dating
Large Letter Stamps: Not 100% sure what these mean, but I have a theory they were used to grade a body prior to recieving a finish. I have seen four A stamps on Natural finished bodies, and a trans-red with an A stamp. I have also seen a D, along with an A on a Sunburst body.
This is just a theory, but if only A's were put on Natural finished guitars as an example, it could help determine if a guitar is refinished.
The first digit is supposed to reflect the year of manufacture, but there are major overlaps in this regard, and . An important thing to look for are the matching serial number stickers in the neck pocket and on the pickguard.
They seem to be found on the bottom of the neck heel, as well as in the neck pocket of the body, or even just stamped on the front under the pickguard on Natural finished guitars.
The trussrod was inserted through the back of the neck and the channel filled with the Walnut "skunk stripe".
This manufacturing process was used regardless of whether it was a Maple or Rosewood fingerboard.
Late 70's Strats have the serial number on the headstock below 'Fender'.
The number will have an 'S' prefix (possibly an 'E', read below) followed by a six digit number.
Be aware of another code found on these pots, 013446.