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Just saw an Eb "Conn-Giant" mouthpiece on the 'bay.
I occasionally see people looking for original-sized Eb tuba mouthpieces.
This was made to be used in the early 20-century American 19" bell "Giant" Eb tubas.
I already have one.

https://www.ebay.com/itm/Conn-12C-Tromb ... 3394277636" target="_blank

I have one that looks just like that, with a "standard" shank - not small Eb shank. Just in case anyone hoped to score a small shank mouthpiece, I wouldn't bet on this one - looks to me like the same usual size as mine, though that's a hard thing to gauge from a photo. It is a nice mouthpiece, though - the usual Conn "funnel" interior, but smaller and shallower than anything they made in recent years, so today that shallow funnel is an unusual option. About like the Conn 3, with a more Helleberg rim.