This is a stainless steel mouthpiece for euphonium with a somewhat rare medium size European shank. It fits random Besson and Willson euphoniums as well as others from back in the day, maybe a few G bass trombones too if it's that kind of day.
From Giddings...
The Kadja is one of our most popular tenor trombone mouthpieces. Rim 1.012, and throat .285. This mouthpiece has a deep funnel shape cup. Designed to carry the largest of ensembles. Great mouthpiece for those who are looking for a huge sound without loss of clarity and articulation. Kadja is a steady breeze off the sea in Bali.
Stainless steel:


