I`ve purchased a used mouthpiece recently and have no idea who made it. It belongs to a tenor trombone and has a large shank. It seems to be pretty old, the finish is almost all removed (once a deep golden color I think). There are the letters "PHD" hand stamped on it`s side with an asterisk (*) below that. Also there is the letter C on the shaft of the mouthpiece. The cup is a little deeper than a 12C mouthpiece. I`d greatly appriciate if someone could help me out here.

Bill