ALERT Whistles

I am looking for information about the types of whistles issued to Air Raid Wardens during WWII. I assume most were issued with commercial whistles, but there are a large number of these ‘ALERT’ whistles on the market. They feature the word ‘ALERT’ and ‘Made in USA’ and have the victory V emblem and Morse code for the letter ‘V’ on the other side. Often found in two-tone marbled plastic.

If you know more about these whistles, drop me a message.

Five ALERT two-tone plastice whistles