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I had to puzzle over this one for a while and eventually reached this hypothesis: this looks like a 5v double bell euphonium from which someone removed the second bell and all associated tubing, and affixed the switch valve so that it always stays on the "airflow towards big bell" position. Thoughts?

edit: OR it's just hopelessly boogered, to borrow a term.

https://www.ebay.com/itm/115902650366?m ... media=COPY

I have no clue. I interesting though

No serial number, so hard to tell.
YYBIC never existed in the “1800’s” though…

I was very, very interested, until I saw the $190 shipping charge to get it to California. Ouch!

If it offers a usable scale and the pistons aren't worn out, someone could pick up an old bell-front E flat something or other and put it back the way it was, I suppose.

arpthark wrote: ↑Thu Aug 31, 2023 7:22 am this looks like a 5v double bell euphonium from which someone removed the second bell and all associated tubing, and affixed the switch valve so that it always stays on the "airflow towards big bell" position. Thoughts?

I think that you're right on the money. The fifth valve stem was removed an the valve is always in the "up" position.
And bloke's right, too. They probably originally just used Eb alto parts made to fit.