I'm probably going to open myself up to considerable abuse, but, I want to know something. I dear friend just gave me a banjo, and I want to know something about it. It is an open back, and stamped in the wooden shaft that runs from the neck to the tail piece, is this info: Fairbanks banjo, made by Vega, Boston Mass. Special number 2. It has a five digit serial number. Ok, experts, what have I got here?