Can’t figure this one out - American ‘77 Fender P-bass I bought about 20 years ago in a pawn shop. It has a 4” x 6” rectangle plastic plate on the back of the body that has been cut/routed in. Painted underneath the plate. Nothing underneath it, only as deep into the body as the thin maybe 1/32” plate. While I know I could be a replacement body, if it is it’s been on there a long time. The bass has been well used but not abused in its 40+ years on Earth. The pick guard was trashed and the original Fender pups were shot, so I replaced both. But they seemed to both be correct factory parts. I’ve attached a few pics. Any thoughts?
That was my first thought, also. Might be Leo Fender's long lost Buckle Rash Resistant prototype P-Bass. In any case, it seems to have worked pretty well...
Buckle-rash protector theory: "I've got an idea - I'll rout the back of my bass and install a piece of black plastic... to protect the back (which I just routed) from being damaged (as in, having a large section of paint and wood removed)..."
Take a pic of the front with the pickguard removed and we can probably tell if its an aftermarket body. That mod is bizarre, but a buckle rash plate is what it seems to be.