Now, I've seen these in Fender chassis for years but I'm not really sure what they indicate. Also, there is also a stamp that says 'Insp 28' which I guess is pretty self-explanatory.
These obviously have to do with maunfacturing nomenclature. This amp has some large ink stamps around the power transformer that say 'T-4', 'W-2' and 'W-4'. Today, I have a silverface Twin Reverb on my bench, master volume, pull boost, probably mid 70s.
I'm interested in knowing about all the stamps and codes and whatnot I see inside Fender amp chassis. I hope I posted this in the proper forum?