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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.
General rules that are usually, but not always, true for stamp collecting values. â¢ Mint stamps with original gum on the back are worth more than used stamps. â¢Earlier stamps are worth more than modern stamps. â¢Stamps with any faults (creases, tears, thins, etc.) are worth far less than those in perfect condition.