#TY106 - Keds Space Yo-Yo Puzzle Decoder Whistle These are vintage Keds premiums found in storage in an old shoe store. They come in a cellophane package with directions. They explain how it is a yo-yo with a space puzzle and whistle in the side. The whistle area of the yoyo has the letters of the alphabet with long and short dashes next to them. The directions say that you blew long or short whistles according to the code to send out messages. It also has a list of "astronaut talk" including the term "photon engine" which was a popular idea in the 1950s which is the time period they are from. You may see one of these around once in a while, but not likely mint in the cellophane package like this with the directions. The ones I've seen before are used and don't have directions. In that condition, they go for around $25 each. These should be better. $12.50