This is an antique "The Metropolitan" patent police whistle manufactured by J. Hudson & Co. of Birmingham. Made between 1888-1909. The whistle is engraved with the company address "13 Barr St" and "Birmingham," which can help date the item. It features a "GPO" stamp, likely indicating use by the General Post Office in the United Kingdom. These nickel silver whistles are highly collectible, with similar models selling for approximately £40 to £150 depending on condition and rarity.
