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Collector plates were a hot market several decades ago when many consumers purchased them as investments as well as decorative objects. However, instead of increasing in value, most plates turned out to be worth much less than their original price.
Vintage Autographed Memorabilia. The most treasured autographed sports items are photos, bats, and balls that are 35 years or older. Prior to the 1970s, most collectors gathered autographs on 3 x 5 index cards, in autograph albums, and on government postcards (GPCs).efore purchasing sports autographs, collectors should be clear on exactly what theyâre buying and do the research required to evaluate the itemâs authenticity. For those looking to build valuable collections, game-used items, game-worn apparel and vintage autographs fetch the best prices.