This is a unique and spectacular mint error, a proof pattern off-metal. It was struck on a copper-nickel planchet instead of a silver planchet. It is composed of 76% Cu and 24% Ni, which is copper-nickel. It weighs .99 grams. PCGS has certified the coin as a Proof-65.
The planchet was smaller than the intended size and was also broadstruck. It is the only known copper-nickel Standard Silver Dime in the entire 1869-1870 series, from Judd #837 through Judd #872. The official Standard Silver Dimes were struck in silver, copper and aluminum.
USPatterns.com states that it is unique and was struck on misrolled nickel 3¢ planchet stock, or on the 1¢ stock for the 1869 pattern cent in copper nickel, Judd #669.
This unique Proof off-metal U.S. pattern struck in copper-nickel was in the world-famous Simpson Pattern Collection. It belongs in a major U.S. Error collection or a U.S. Pattern collection and is one of the most fascinating Proof pattern mint errors known.
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World’s Greatest Mint Errors
The book World’s Greatest Mint Errors is an enjoyable numismatic resource packed full of some of the rarest, most dramatic and extraordinary errors and die trials ever assembled in one publication. It combines stunning imagery with the most accurate information available to provide anyone interested in mint errors with the latest data on mint error coins from the United States and around the world. Hundreds of spectacular errors are pictured. Each error coin photo is presented in full color and enlarged to enhance the smallest details.
Some of the error coins featured in this book have never been seen by the public before, and each is described in great detail as to the type of error, the assigned grade, rarity, and estimated value. The release of World’s Greatest Mint Errors has only helped to further interest in the field in non-collectors and advanced collectors alike. This book is a must-have for every numismatic library.