ACME Thunderer 60.5 Air Ministry Whistle( Nickel Plated, Polished Brass, Distressed Brass and Antique Brass )
 
The Original Flight Jacket Whistle as worn by RAF & USAAF pilots and aircrews during World War II Referred to as the “Ditch” Whistle at times as it was used by pilots who had been shot down in the Ocean to attract attention from passing ships. Marked using the same dies dated back to between 1939 & 1945 Small Thunderer.