Called 'crickets,' these toy clickers were supplied to the troops of the U.S. 101st Airborne Division to jump into Normandy with on D-Day, June 6th, 1944. It was used as a communication device and was originally known as the No. 470 clicker. The orginals and these replicas were made by manufacturers J. Hudson and Co. Ltd of Birmingham, England, using the same machines and dyes. Made of brass, steel, and nickel.