This is a Berg Larsen HR Slant 95T O baritone saxophone mouthpiece. Its tip opening measures at 0.088. This is a very rare and beautiful mouthpiece. The early 40’s Slant signature Berg Larsen mouthpieces are among my favorites because they combine warmth and projection without taking over the horn’s innate tone. If you want to brighten up a Conn baritone, you can use this and it will still tune well, because the chamber, while meant for project, is still pretty large, and the shank is long as well. There is some light wear from age, but this is about as nice an example as you are ever likely to see.