Car or motorcycle horn.
Technical description: Flared horn of brass, length 192, proximal diameter 43, distal diameter 82; with fine metal grill over distal end. Inlet tube internally threaded to connect to horn length 118, diameter 20. The inlet tube enters the flared section of the horn and passes up through it, doubling back to an exit near the base of the horn flare, effectively giving the horn a sounding length of twice its physical length. Single metal beating reed length 54, width 13 in brass housing.