Double-denomination coins are among the most coveted curiosities ... According to the Professional Coin Grading Service (PCGS), this mistake affected nearly every 20th-century coin series ...
Since its inception in 1986, the Professional Coin Grading Service (PCGS) has certified only 18 1968 No S Proof Dimes. Heritage Auctions sold one specimen for over $40K in 2008. Be Aware ...
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