This is a Giardinelli (New York) model "C12," a manufacturer that no longer exists. Detailed specifications are difficult to find online. If needed, please refer to the following site, which produces "Giardinelli C Series Replicas": https://osmun.com/giardinelli-c-replica-horn-cup/ "The Giardinelli C series is one of the most popular mouthpieces ever made. It was designed by James Chambers, the legendary principal horn player of the New York Philharmonic, who performed under Bruno Walter and Leonard Bernstein. They have a very deep bowl shape and are ideally suited for instruments such as the Conn 8D, Holton Farkas model, Paxman 20, and Hans Hoyer 6802/7802." While there are minor scratches and some cloudiness, it retains its luster and surface condition as shown in the photos, with no major scratches or distortions. There is some plating wear on the shank. I no longer use it because I switched to a European-type instrument. As I have an attachment to it, I decided to list it here, hoping that someone who needs it can use it, or that someone who appreciates its value will own it, rather than letting it sit unused.