Perantucci Tuba Mouthpiece PT-65 Silver Plated
 
These mouthpieces are all new old stock and some include the "Mr Tuba" stamped on the mouthpiece from the factory.
 
Perantussi say the following about this mouthpiece.
Model PT-65 Solo, Ensemble and Orchestral Mouthpiece.  The PT-65 utilizes a cup which is similar to that of the PT-64. The rim is semi-cushioned with a rounded inner edge. Throat and shank bores are calibrated for a dark tonal quality, strong core and excellent low register response. Due to the weight of the rim and body mass of the shell relative to cup volume, this is essentially a heavy-shell mouthpiece.

Also works well as an Eb tuba solo or brass chamber music mouthpiece.

Cup Diameter: 32.00 mm, shallow, bowl-shaped
Rim: 8.50 mm, semi-cushion with rounded inner edge
Throat bore: 7.80 mm
Resistance: Moderately strong
Standard Large Shank for most European Models (recommended for most instruments)
 
Please note - For mouthpieces purchased online I am not able to offer trials - if you are looking to try this mouthpiece, please contact Mr Tuba at sales@mrtuba.com
 
These mouthpieces are all new stock.  They may have the odd mark on the shank where they have been inserted into an instrument in-store and the box maybe a little tatty, but they are all new stock.
 
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.