This is a Vincent Bach Corp. 24AW tuba mouthpiece. It's an older model with the "corp." engraving. It's valuable, so I've kept it in my collection, but I'm selling it because I don't use it. It shows considerable wear, and there's a dent on the shank. Please refer to the specifications below, quoted from the following website: ■ Tuba Mouthpiece ■ 24AW ■ Cup Depth: Deep ■ Rim Diameter: 31.25mm ■ Throat: 8.33mm ■ Price: 16,400 yen