I just saw this in stereo - both from a member's PM and from my daily eBay search. This is a VERY nice Imperial from the look of it, and it priced to sell.
It has a medium receiver, valves look good, almost no denting, finish is lovely. The round-side original case is included, which I found to be a protective case for my own Besson when I traveled. The buy-it-now price is $2,299 and shipping is only $85.
ITEM IS NO LONGER AVAILABLE
https://www.ebay.com/itm/Boosey-and-Hawkes-Imperial-Compensating-4-Valve-Euphonium-SN-303736-SATIN-SILVER-/333839997848