This is a vintage Brilhart Tonaline Streamline mouthpiece for the tenor sax, serial number 27012. This piece is stamped a 5 and measures .085". It is in incredible condition, with just a small amount of minor scuffing on the bite plate, and no other wear of note. There are no cracks or chips, and no major scratches. So often on these pieces the black lettering fades completely off, but here it all remains intact. The tip and rails, all original, look like new.