This a nice vintage Dukoff Fluted Chamber tenor mouthpiece. The piece is stamped a 3*, but was opened up to .098" by Brian Powell, and as you can see from the pictures his work is fantastic. This mouthpiece really sings!! The large chamber gives the overall sound a kind of Slant Sig Link vibe. These are very good mouthpieces, and this is a great example of what vintage Dukoff should play like.