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davidcyclebackMostly made by the Exhibit Supply Company, the postcard sized Exhibit cards were made from the 1910s-60s and were sold in vending machines. Exhibit Supply made the machines. Subjects include baseball, football, wrestling, boxing and movie stars. The cards are generally cheap, except for Pre-War baseball stars and and a few other sports notables. As you didn't mention condition, it's impossible to determine value, but it's unlikely that you've made a great find. $3.50 for a common 1950s wrestler with honest wear is probably a fair price, and is probably not worth much more.