My friend is offering to sell me her Bauhaus Walstein alto. Neither of us knows anything about them (she had it as a gift) It is silver and gold if that helps work out what model it is. Does anyone know anything about them, in particular what it might be worth. (Ballpark) I want to establish a fair price for both of us obviously. It seems in good condition and is definitely playable. I'm not looking for anything amazing, I'm just a beginner looking for a reasonable horn and I'm scared of buying blind on eBay.