The picture below shows larger front and back views of this 1920s CrackerJack Pop Corn Confection Advertising Embossed Tin Toy Prize Whistle. It is not dated but was used as a prize in the 1920s. It is not marked and the maker is unknown. This round tin whistle is similar to a screamer whistle. There are two halves with a hole in each to blow through. It is embossed marked “CRACKERJACK” on one side. The whistle measures about 1-3/16'' x 1/4''. It appears to be in good condition with wear as pictured.