This is an ACB (Austin Custom Brass) trumpet mouthpiece, model MV1.5BC. It appears to be a copy of a Mount Vernon era BACH 1.5C. It's similar to a Bach 1-1/2C, but slightly heavier overall. It produces a solid, full sound. For those who prefer a larger mouthpiece, how about this one? There is no plating wear or dents. It appears to be a copy of a 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.