1941 Ovaltine premium ring is all brass with large wing designs on each side while the top has a brass cover over a blade which spins when blown to produce a siren whistle. Ring requires significant lung power to operate. Ring has exceptionally bright and NM luster. Instructions are 2.25x4.5” folder that opens to 6.75” wide telling “The Story Behind Your ‘Whirlwind’ Whistling Ring.” Back of the folder gives Captain Midnight’s “Secret Signals.” Light age tone and a few tiny marks on the folder but Fine. Ring is rarely found this nice and instructions are scarce.