This is a silverplated brass mouthpiece for a tuba or sousaphone. It is marked on the outside of the bell, Olds Los Angeles. It is 3 1/8" in length and a 1.5" outside diameter. Inside diameter of the bell is 7/8" with a depth to the bottom of the cone 1 1/16". The shank 1 5/8" from the ridge to the end.
Please let me know if you need any other pics or info. I combine shipping which goes out same day or next