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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.
Take for example this stamp: A similar looking stamp can be found easily on most stamp collections, very likely one or two are in your hands too. However, whereas your specimens are likely worth less than one cent, the above stamp is worth $100.