Dear all

Sorry if this is in the wrong section, but I would like a quick response if possible.

I have a B&M Champion trumpet, which I used to play 15 years ago so I imagine the trumpet is around 20 years old, as it was second hand.
It is in excellent condition apart from two tiny dents on the bell. It is in its original case and has the original mouthpiece. I have seen one of these advertised for 25GBP (awful condition) and one for 250, which is a big difference!! I am looking to sell this but I thought who better to value it than the experts!!
Can anyone give me a rough idea how much this should be sold for?

Many Thanks