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hankronPaul is correct. A manufacturer of games or hats or kites might choose to trademark a unique name or design by sending in samples. However, this set does not appear to be samples sent to the Patent Office. As Paul noted, the registration date is printed on the cards, and a company had to send in the product samples before getting a trade mark ... This does not proclude the set from being the company's prototype for a set never issued. It is not ucommon for companies to jump through the copyright and trademark hoops for products that may or may not reach the market.