I purchased this guitar in 1970-71 from a pawn shop. I’m thinking of selling it and so I was looking up the serial number. I don’t find the serial number anywhere. If you look at the picture, it’s a 212xl following the serial number, which seems to not have enough digits, there is something that looks like it might be SS or possibly 55. Anybody have any idea about this serial number? It’s not listed in any of the list of numbers.