bore: 10,50 mm (0,413 ), 4th valve giving a quart gold brass bell diam. 170 mm (6,693 ), direct air column Monel valves, 3 water keys trigger at the first slide B11/2 C mouthpiece, deluxe soft case
bore: 10,50 mm (0,413 ), 4th valve giving a quart gold brass bell diam. 170 mm (6,693 ), direct air column Monel valves, 3 water keys trigger at the first slide B11/2 C mouthpiece, deluxe soft case