Bb bass slide trombone, open wrap, double rotor, by MIRAPHONE
model 691
bell diameter 250 mm (9,843 inch)
443 Hz
without lyre holder
type of valve Minibal linkage
bore of inner slide 14,3 mm (0,563 inch)
trombone inner slide nickel silver-hard chrome
material of mouthpipe nickel silver
mouthpiece PO15
lacquered
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