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Hi,
I have a small-shank Eb tuba mouthpiece "G81 Made in England" written on the shank, which works perfectly with my 1980 Besson Eb three-valve compensating tuba. I saw a G83 advertised. Which one is larger? I don't want to switch but I am looking for a spare. Thanks a lot. Bill

Brand? Photos?

You're not giving us very much to go by, here. So my answer would have to be that the difference between a G81 and G83 would be "2"…

If it is inexpensive, go ahead and buy it and find out. That's what I do. Then if I don't like it, I flip it.