Perantucci Tuba Mouthpiece PT-45 Silver Plated
 
These mouthpieces are all new old stock and some also include "Mr Tuba" stamped on the mouthpiece from the factory.
 
Perantucci say the following about this mouthpiece.
The PT-45 is the ultimate realization of classic American mouthpiece philosophy.

All desirable factors concerning sound quality, resonance, large dynamic range. tonal modulation, facility and efficiency are combined. Cup diameter. cup volume and throat bore are large. Shell weight and resistance are balanced for Tonal strength and ease of execution.

Cup Diameter: 32.50 mm, deep and pear shaped
Rim: 7.60, narrow with clearly defined inner edge
Throat bore: 8.50 mm
Resistance: Free-blowin 
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.