Mr. Bloch, Excellent performance of this beautiful piece of music! thanks for sharing it here on RU-vid with others like myself who have played euphonium for many years but never had the chance or the music to play this higher quality of classical music! Thank you so much for this performance, Dan
It looks like a SM Ultra by Dennis Wick, especially given that particular mouthpiece pairs very well with (and was designed for) the Besson he's playing on in this video.