Nickel plated brass Thunderer Whistle on a keyring by Acme.
All ACME Thunderer whistles are fitted with a legendary no stick Pea. They work even after complete immersion in water, and are unaffected by even the worst rainstorm. Unbeatable in strong winds and easily heard because of their fluctuating frequencies.
Acme is the world’s largest and most famous producer of whistles. The company was founded over 150 years ago in Birmingham, England and continues to offer quality products. Officially approved world wide by over 200 sports bodies and referee associations covering over 50 sports and recreational activities.