VINCENT BACH CORP. 5MV Trumpet Mouthpiece This is a trumpet mouthpiece from BACH, a standard trumpet manufacturer. The size is 5MV. It's a popular old engraving (CORP.). The MV in 5MV is a slightly larger engraving. This is the V cup series (5V, 5MV, 5SV) only available in size 5 from Bach. The rim is slightly thinner compared to Bach 5C. There are some scratches, but overall, I think it's in good condition. I think it's a rare size that's not often available.