Hey guys i was wondering if any of you could help me there is a washburn 4 string that i am considering buying but i need to know what it would be worth. It is a 4 string washburn custom shop bass with 1 musicman pickup made by bassline. It has 4 knobs one is a push pull but im not sure exactly what it does as i havent played it on an amp yet. Here are some pics. On the back of the head stock it has a custome shop piece of it as shown in pics. There is only 1 crack in the gloss finish but i dont care about that other than that its perfect. Any help would be greatly appreciated.