The picture shows this Old Cap'n Crunch Cereal Premium / Prize Bo'sun Whistle. This blue hard plastic whistle is not dated but believed to be from the 1960s. It came in the cereal box. It has an image of Cap'n Crunch on one side and Seadog on the other. It is also marked
Cap'n Crunch Bo'sun Whistle
The whistle measures 3-1/8" and is in excellent condition with some wear as pictured.