dogbone

So I have what is a rare item A cook bros dogbone stem 1" quill 150mm length high rise. What is an estimated sale value?

this crankset belongs to of a friend of mine. he asked me to put it up for sale here. the 130mm long bb (which is presumably made by white industries, but not 100% sure since nothing is written on) will be included. he's asking 350€ including also the set of chainrings (fsa platinum 48 | 38 |...