1999-P Georgia State Quarter
Broadstruck on Experimental Planchet


slab slab

Offered here is the only known U.S. State Quarter that was broadstruck on an experimental planchet. It was authenticated and certified by PCGS, weighs 6.7 grams and graded superb gem MS 67. It has the golden color of a Sacagawea Dollar. I discovered the original group of 1999 State Quarters that were struck on Experimental Planchets. Coin World featured my discovery in a front page article.

Copyright story reprinted by permission from Page 1 and Page 20 of the November 26, 2001 issue of COIN WORLD, Sidney, OH (coinworld.com)

Coin World
Coin World
Coin World

imageblankThere are approximately 20 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 $15,000 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.

Here are a few "telltale" signs to determine if you have discovered a State Quarter on an EXPERIMENTAL PLANCHET in circulation:

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.

lab analysis

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.