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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.
While some one cent stamps from the civil war era are worth hundreds of thousands of dollars or more, others can change hands for around $20. The most highly-prized of all the one cent stamps is the 1868 'Z' grill-the grill being a pattern of tiny squares embossed into the paper and visible on the back.