ML bore .459“ = 11.66 mm Bell Ø 4 13/16" = 122.24 mm 37 bell with side seam bell, 25 mouthpipe One-piece hand-hammered bell with stainless steel ring Monel-pistons, two-piece valve casing brass/nickel silver Wide sculpted bracing Thumb ring on 1st valve slide, 3rd slide ring Vintage finger hook, Anniversary engraving Incl. 2 sets of valve guides - brass/plastic Original VINCENT BACH 3C mouthpiece Oblong wooden case „Anniversary“ C180A Brass, silver plated 190S37 Made in United States