TromboneChat

Hi,
I'm back to the instrument after 35 years and am experimenting with the 3 different mouthpieces I have on an old '59 Roth small bore tenor. Liking the Holton Collegiate over the 12C or 61/2 AL.
The question is what size is that mouthpiece. I've heard roughly a 7C and just want to verify that if possible.
Thanks , Rob

I had a Collegiate mouthpiece that was also labeled 12C.

Thanks
Mine has no size engraved, just "Collegiate Frank Holton & Co Elkhorn WI".
Seems to be a slightly different animal than my King 12C.