Technical description: Silver-plated brass. 4-valve `Enharmonic' system: mouthpipe leads to 3rd valve, 1st and 2nd valves double with respect to 3rd valve; 4th valve compensating with respect to 3rd valve. 2 water-keys, one on main tuning-slide. Screw for music card-holder. Hinged catch to hold 4th valve in closed position for transportation. Valve type: 4 Périnet-type valves. Repair History: Removable main tuning-slide extension pieces for low pitch (brass, not original).