Vintage Memorabilia KLEEN THINK CARDS

This set of trick cards were published in 1911, and are not a recent reproduction. Put on the market by W. Kleen, New York City.

The Kleen Think Cards enables anyone to readily discern any question mentally thought of by another person. Positively no confederacy. Anyone can learn it in five minutes…….!!!!!
The set consists of six postcard size cards, and the original envelope. Never used and in Fine (old) condition.