I've never seen one of these.

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Does anyone know anything about this Vincent Bach "JAZZ" mouthpiece?

[When was it made (in New York), what are its specs, who played these pieces, etc.]

I first ran across one of these in the 1980`s, a student had one in his grandfathers trombone.

I also owned one in the early 2000`s. The "Jazz Small" is about a 12C size

Rumor has it that there were Medium and larges also but I`ve never seen any of those sizes

Both that I`ve seen were NY