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I wonder if anybody has the specs to this mouthpiece. There is no info on line anywhere! Google failed here. It says Dr. Young model. The box is labeled " sousa " .

Would you consider selling it?

Take a picture of the mouthpiece from the "front" with a good steel millimeter rule laid across the rim with the edge at the diameter. We can extrapolate from there.

I have one of these & it's an awesome mouthpiece!
It is a fairly heavy mp with a wide rim (rounded on outer edge) & a pretty sharp inner edge with
approx. measurements........inner rim dia. is 32.3 mm with a 9.4mm rim width & a throat size of 8.4mm
The cup Is just slightly deeper than a Blokepiece Symphony

That is beautiful. What you are measuring is pretty much like either a Yamaha Canadian Brass or a Josef Klier T-4A. A Miraphone TU-21 is also close but won't have nearly so wide a rim.

A local resident, about a mile away from me has a Reynolds mouthpiece, somewhat smaller than this one, which I would love to have for an F tuba mouthpiece but he is using it for a Christmas tree decoration and is sure it is worth a lot of money because I showed a little interest in it. It is stuck in the receiver but he sawed 6" of that that off so he could use it on his tree.