Just Certified by PCGS: Experimental Connecticut 25¢ CLICK BELOW TO READ THE FRONT PAGE COIN WORLD ARTICLE | ||
There are approximately 15 known 1999 State Quarters struck on Experimental
Planchets. All five states in the 1999 series (DE, PA, CT, GA and NJ) have been discovered. These Experimental State Quarters have sold for as high as $10,000 each, depending on which state, the coin's condition and which type of experimental composition was used. There are four known types of experimental compositions which have been discovered so far on 1999 State Quarters. | ||
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These coins were analyzed by spectroscopy (SEM-EDX) using electron microscopy and energy-dispersive x-rays to determine the alloy composition. The predominant metal is copper, followed by zinc. There are also small percentages of manganese and nickel. PCGS and NGC have both authenticated and certified these 1999 State Quarters as being struck on experimental planchets. A Freedom of Information Act (FOIA) request for copies of any reports and test results was submitted to the Department of the Treasury. They acknowledged that the U.S. Mint conducted engineering and metallurgical tests as part of its development of an alloy for the Golden Dollar, but would not release any information. The specimen photographed here is a Connecticut State Quarter with the "color" of the Sacagawea Dollar and a copper center core. |