Acme Thunderer Square Whistle features a deep tone and is extremely loud.

Made from solid Brass, Nickle-Plated. 

Acme Whistles crafted Since 1870. Pioneered by Joseph Hudson started work at the age of 12 in the engineering workshops of Birmingham. He trained for 7 years as a toolmaker learning to do by hand the many tasks so often undertaken by a machine today. In these early times he learned the skills that made him a superb craftsman in metal, later forming J Hudson & Co Whistles Ltd. Acme.

Made in England. 

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