Perantucci Tuba Mouthpiece PT-24+ Heavy 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.
An excellent general purpose mouthpiece for F, Eb, CC and BBb tubas featuring a comfortable rim and a large throat bore for depth of tone and volume. Optimized for solid sound with good projection and accurate response in all registers.

Cup Diameter  : 31,0 mm Moderately deep, well rounded at bottom.
Rim : 10,0 mm Wide cushion rim.
Bore : 8,5 mm
Resistance : High
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.