This item is a vintage J. Hudson & Co. Metropolitan whistle, commonly used as a police whistle or an Air Raid Precautions (ARP) whistle during World War II. Manufacturer: J. Hudson & Co. of Birmingham, England. Material: Nickel-plated brass. Significance: Widely used by British police and ARP wardens for communication, especially during air raids. Features: Often engraved with "METROPOLITAN," "A.R.P.," and "MADE IN ENGLAND".
