Distin Distin, E flat helicon, 3 piston, c.1869-1871 Distin, E flat helicon, 3 piston, c.1889 Distin, B flat euphonium, 3 piston, c.1904 Distin, E flat tuba, 3 pistons, ca. 1896-1899 Share this:TwitterFacebookLike this:Like Loading...