Fellow Bass Heads, I may be getting my mitts on a '87 Guild SB 602 fretless 4 string. There is very little wear on the fingerboard from roundwounds. Everything on it is original. If I get it, I'm considering a refinish because there is a really nice flame hidden under an ugly, barely see through olive green/doo-doo brown finish. I'm also considering having the fingerboard planed and re-leveled/poly finish. I know that alot of bassist dig these because (A). they sound awesome, and (B). it's the last (only?) fretless Jaco endorsed. Am I de-preciating it's value, or, is it not considered a collectable item ? Thanks for your help.