The information below is primarily excerpted from Pollock and from the August 30, 1993 and September 6, 1993 issues of Coin World by Kenn Henderson.
This metallurgical trial was produced by Dupont in 1964. They were one of several companies the U.S. Mint commissioned to find a suitable alloy replacement for silver.
The obverse is of Benjamin Franklin.
These were struck in a nickel alloy bonded to a copper core. Only 5 examples are believed to have been struck.
Photo is a scan from the Pollock book.