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I'm trying to find an original York "Kaiser" mouthpiece that would have been included with a Monster BBb from about 1910, preferably in playable condition (tall order, I know).

Receiver opening on this horn is .656 - it swallows a Euro shank whole. The small end of the shank should be about .585, according to a Matt Walters post here.

Thanks!

Prolly scarce as hen's teeth. I'd like to have one also!

for my York.....I had Mike Finn ship one of his new MF3H mouthpieces up to Dillon and they reshanked it for me. Wonderful!