Acme Siren Whistle No. 147
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AI Generated: The Acme No. 147 Siren Whistle, famously known as the "Cyclists Road Clearer" since the 1880s, is a high-quality percussion instrument crafted in England from nickel-plated brass. It features an internal spinning turbo wheel that creates a "whoosh" sound which continues briefly even after you stop blowing.