This is an ACB (Austin Custom Brass) trumpet mouthpiece, model MV1.5BC. The rim appears to be a copy of a Mount Vernon era BACH 1.5C. It's similar to a Bach 1-1/2C, but slightly deeper and heavier. It produces a solid, full sound. For those who prefer larger mouthpieces, how about this one? There is no plating wear or dents. It seems to be a copy model of the Mount Vernon era BACH 1.5C. There are no scratches or dents. This is a rare model that is not often available and is valuable.