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Would anyone happen to have a catalog or page showing this mouthpiece? I have a page in electronic form showing the Giant E flat tuba mouthpiece, the BBb, the Chief, and the Conn Special Ltd or with "Conn L" on the shank but I don't have a page showing the "Conn S" on the shank of a mouthpiece that has the same outer shape as the Conn L. I was wondering what it was originally designed for.

Once I saw a Conn with an" S" on the shank on ebay but it had an outer shape like the original hellebergs. Someone else won the auction. Does anyone know how the Conn S with the outer shape like the Conn L compares to the Conn L? Thanks William

I don't have the catalog but I have one of these mouthpieces. It's very small, about half way in between tuba and bass trombone. Probably comparable to a contrabass trombone mouthpiece.
It's my understanding that these were intended for conn's smallest tubas. In this period (early 20th cent., pre-model names) conn seemed to like to label things S, M, and L - the early trombones have the same system.

Thanks for your information. I think you are right: it is for a small tuba. I thought that this Conn S was the size you described.

I read another post some years ago by a professional trombonist who owned a Contrabass trombone in BBb that was owned by Sousa, and he said that the Conn L came as standard on that instrument. It is a shallow funnel. So, probably the Conn S that I was referring to was made for their small E flat tubas--smaller than the Giant or Monster ones. As I said, I did see a different "S" Conn on ebay some time ago, but the outward shape was like the original Helleberg not like the Conn L.
Thanks, William

Conn has also been known to apply the same nomenclature to several different ranges of mouthpieces, for example a Conn 3 might be a tuba mouthpiece, or a very different trombone mouthpiece. With a little more foresight, they might have realized how confusing that would be on EBay.

Yes, you are right. I read a post from some years ago, and the tuba player said that the "S" and "L" were also used for mellophone. I am interested in these old mouthpieces because I have a vintage tuba and only a few mouthpieces work perfectly with any tuba. William
(actually my name is Bill but the post office won't give me packages unless they say "William").

I suspect I was the one who bought the "S" in question on ebay a while back. It fits nicely on a small 1894 Conn Eb that I have had since the mid 1950s - small shank like B. Trom. It looks better on the horn than it plays. When actually using the instrument a larger Herco Eb works adquately.
Bob in Iowa