Hotrod vintage police/fire engine truck siren, works w/old red paint

Vintage automobile siren with old red paint. We're not sure of the exact vintage of this siren, but were told that it is probably from the 1940s through the 1960s. This measures about 6" long, 3.25" across the horn and 4" high over the mounting brackets. We've hooked this to a 12 volt automotive battery and it runs well, but one of the mounting ear brackets is broken, so we're selling this for repair or parts.