A Police Constable's "The Kinglet" Whistle

Nickel-plated brass alloy, with a shaped mouthpiece and two distinct chambers for passage of air to exit on either side, plus a ring on the opposite end for attachment to a chain, marked "THE KINGLET", impressed "P.C." (Police Constable) above "337" and maker marked "J.H & Co 16" (J. Hudson & Company, Birmingham, 1916) on the cylindrical shaft, measuring 17.8 mm x 91.5 mm, contact marks, very fine. Footnote: The trademark for The Kinglet whistle was registered in 1907 by J. Hudson & Company of Birmingham, England.