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I've got a Bach 32 E and a Yamaha 6?C, both which are very small. I also have a Gardianelli 25 which is smaller than the Bach 25. If you are interested in trying any or all of these let me know via PM and I'll send them to you on a trial basis.
These are so tiny I'm surprised I still have them kicking around.

I have a remington mouthpiece which I use on Euph / Tenor Tuba.
it's a bit tarnished due to the fact I have not used it in over a year but no dents , cracks or any damage to the shank , cup or rim. Will dig it out and get some more info / photos on it.
pm me for further info.
ta

I've got a Yamahaha Bobo TT replica that I'm not using. Is this what you're looking for?