This is a Besson euphonium. It has 4 pistons. It is engraved with "MADE IN ENGLAND BE765-862828". All pistons and slides move. Some parts are a little sticky. I played this in my student days. I am selling it as junk because it is missing the mouthpiece and I have lost my ability to play, so I cannot confirm if it produces a sound. I am selling it at a low price, so please bear the shipping costs.