I have a Besson 600 series cornet (about 7 years old but only used for 3, stored safely for last 4), in silver plate in very good condition (all slides move smoothly, one scratch and slight dink/bend in the bell which i'm sure could be pushed out very easily, hardly noticeable), case in perfect condition with perfect new Dennis Wick 2 piece cup mute and humes & berg straight stone lined mute. It has the mouthpiece that came with the instrument and a Dennis Wick mouthpiece. I play the Euphonium now so want to sell this instrument, 2 mutes and 2 mouthpieces. How much is it worth?! Everyone's view is welcome as I'm stuck and would like a good few opinions before i sell.