Have a Vintage lot of 3 whistles for sale, “The ACME Thunderer” Made in England. A old police issued “Pro 66” whistle. And a old silver whistle made to look like a Acme thunderer but not Acme at all . Whistles are old and i did not care to put lips on them to test. I put a garden yard blower in front of them and sounded very loud for the most part even over the noise of the electric blower. Anyways. If you collect whistles then heres 3 for your consideration. Thanks for your interest