I have an old Carl Thompson Bass from the late 70s or early 80s. I want to know how much it is worth. Its a 4 string fretless. There are at least 3 types of wood. Its not fancy like some of the other basses I have seen by him. Its an interesting bass, but I want a gretsch. Its my dad's. I am currently 14 and I want a bass that is more geared to jazz. Should I sell it.