Tuba F-attachment mouthpiece

This is a rare vintage mouthpiece.
It was originally from a B&SF tuba and was purchased by the previous owner about 40 years ago!
It's a type where the rim detaches, which is no longer made. I was told that at the time, players would swap out rims of different thicknesses to suit their playing style. I also used it for a long time, but I've decided to sell it as I no longer have the opportunity to play.
It produces a wonderfully resonant tone and can handle a wide range of notes, so I highly recommend it!
It's a bit pricey, but you won't regret buying it.