This is a great-looking horn! The case is included and also looks near perfect. Buy-it-now price is $4,699 and there IS a make-offer button. That's a very fair price, IMHO. (Many more photos in the listing)
SOLD, APPARENTLY
https://www.ebay.com/itm/Besson-Model-967S-Sovereign-Compensating-Euphonium-SN-460468-GORGEOUS/333269976830