![]() The postmarks on the reverse of the postally used cards are a reliable guide. Other resources for identifying cards are digital collections including those at the University of Delaware and the Library of Congress. Assessing an old postcards value How to establish a cards age The first thing to do is to determine the approximate age of the cards, as the vast majority of cards issued after the 1960s have very little value. Some websites have unusual postcard books for sale, including or, where you can find dozens of guides to help you identify your postcards. Rare and Expensive Postcards: a Price Guide by John M.The Encyclopedia of Antique Postcards/Price Guide by Susan Brown Nickolson. ![]() Linen Postcards: Images of the American Dream Price Guide by Mark Wether.The Golden Age of Postcards Early 1900s by Benjamin H. ![]()
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