Perantucci Tuba Mouthpiece PT-50+ Heavy Wall Model Silver Plated
 
These mouthpieces are all new old stock and also include the "Mr Tuba" stamped on the mouthpiece from the factory.
Perantussi say the following about this mouthpiece.
Model PT-50´s cup width, rim contour, cup properties, throat, shank bore and shell weight are symmetrically balanced for amazing equilibrium. Tone is full, deeply resonant while retaining excellent projection. Resistance is balanced for good response and efficiency.

The 1 1/2C of the tuba world, used and recommended by thousands of players.

Cup Diameter: 33.00 mm, deep with a semi-rounded funnel shape
Rim: 7.50 mm, flat rim with sharp inner edge
Throat bore: 8.30 mm
Resistance: Open-blowing
Shank: Standard
Standard Large Shank for most European Models (recommended for most instruments)
 
Please note that I do not offer approval / testing on these mouthpieces, so please ensure you know what you are ordering when placing an order.
 
I find mouthpieces impossible to take photographs of due to the reflections, so the image shown in the stock image from Perantucci.  I am happy to supply additional images if you send me a message.