Prior to sponsoring Captain Midnight, Ovaltine spionsored the Little Orphan Annie radio show. The Mirro-Magic Code-O-Graph utilized the same dies for its cipher elements as were used for the 1938 Radio Orphan Annie Telematic Decoder Pin. However, in the Telematic pin, the elements were made of brass; the Mirro-Magic used aluminum elements. Because the aluminum elements were softer metal, there was slippage between trhem, making deciphering messages extremely diffivult. The Code-O-Graph boasted a "secret compartment" when it had its red plastic back on.