The mouthpiece was removed from a beginner's coronet case after 40 years storage in a dry basement. Stamped "Germany". I am not a musician, so please forgive errors in technical descriptions. The outside diameter of the cup is 27.3 mm diameter with an approximate inner diameter of 15 mm and depth of 9 mm. The overall length is 70 mm and the weight is 80 g. The mouthpiece has small chips as shown. Due to the lack of rust, shine, and inner material appearing at the chips, I am presuming it is made of solid nickel as a plated mouthpiece in the same case exhibited severe rust. The outside diameter of the part inserted into the horn is about 9.0 mm.