This is a Wonder mouthpiece that came with Conn's Wonder model cornet, etc. It's almost 100 years old and extremely valuable. It has a flat rim and is about the size of a 7C, with a straight V-cup about as deep as an A, producing a classic sound. The sound is completely different from a trumpet. The shank is the same as modern cornets like Yamaha and Besson, so it can be used as is. I think it would be good for the front row of a brass band, orchestra, wind ensemble, solo pieces, etc. Please take this opportunity to get it.