This is a very nice vintage Steve Broadus “Perfected Model” mouthpiece for the alto sax. This was originally an S4, a fairly uncommon mouthpiece as most of the Broadus pieces you see are the traditional S3. It does appear the mouthpiece has been refaced at some point, measuring now at .066”. The work is good and the mouthpiece still has its original character. It is in pristine shape showing no wear of note. These are nice pieces, it plays similar to an old Link but with a slightly rounder tone.