This is the Martha Washington dime. It is believed to be the first metallurgical trials using the current cupro-nickel clad planchets. The Martha Washington obverse was designed by Edward R. Grove and the reverse is by Philip Fowler.
There are 6 examples in the Smithsonian embedded in two blocks of blue lucite along with J2116/P2082 and J2134/P2083. To view one of these blocks, click here.
In collectors hands, one was offered in the 2003 ANA sale and another in AU grade was offered by Heritage in their 2007 FUN sale. As of today, over a dozen are known.
Since then, additional information regarding these dies has come to light was is listed below.
In addition to the cupro-nickel clad examples listed above, these were also believed to have been struck as follows:
50% silver, 50% copper J2102
silver clad J2103
columbium (type 1) J2104
columbium (type 2) J2105
Monel (nickel base alloy) J2107
nickel-5% silicon with magnetic core J2108
stainless steel (type 301-Type I) J2109
stainless steel (type 301-Type II) J2110
stainless steel (type 302) J2111
It is not known if any of these still exist.
A reverse die, of the second type, was offered in Heritage 2015 ANA sale.
The following additional information was added on July 27,2000
An off-center obverse copper dime trial of this design on a copperplated zinc planchet has since been discovered. For more information about this, click here.
Photo courtesy of the Numismatic Guaranty Corporation of America and Eagle Numismatics.
These dies are now used by the U.S. Mint to test various planchet sizes and alloys and also coining presses. They were used in 1999 to test the new "brass" planchet used on the Sacagawea dollar. To view one of these trial pieces, click here.
These dies were also given out to certain vendors including IDX Inc, PMX Industries and the Olin Brass Corporation by the Mint to test planchets and may be the source for the one or two pieces which have recently appeared in collector's hands.