I acquired a Vintage B & H Imperial Euphonium from an antique shop in New South Wales, Australia. It came without the case or the mouthpiece and my headache was that the instrument only receives a medium bore mouthpiece, which is not easy to come by. Luckily I found this mouthpiece from the Thomann website. It is amazing that Denis Wick still comes up with new designs for medium bore instrument, which has gone out of fashion when the Sovereign model came out during the 1970's.
I just can't thank Thomann enough to have this type of mouthpiece in stock, which represents a niche market for those who love playing vintage instrument like me.