four police/referee whistles

The three on the LH side are "THE ACME THUNDERER MADE IN ENGLAND" and the one on the RH side is "AMERICAN CLASSIC U.S.A.". All nearly identically made (but for the names) of chrome plated brass and no doubt remaining very commonly found items probably still in production today, I've had all four of these somewhere in a drawer for at least 30 yrs. [what's bugging me is that I *also* think I have a 5th still hiding someplace, which actually *was* slightly different from these in its design thus maybe actually more old/unique/interesting?? <sigh>]