Austin Custom Brass Trumpet Standard MV 3C
Austin Custom Brass MV 3C Trumpet Standard, Trumpet Mouthpiece, Standard series, Outer diameter: 27.23 mm/ 1,072"", Inner diameter: 16.87 mm/ 0,664"", Cup shape: Medium shallow C bowl, Relative cup depth: 7"", Shape of the backbore: MO, Silver-plated, Comparable to Bach Mt. Vernon 3C or Monette B4S