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.
This is the Indian obverse design.
These were struck in a nickel alloy bonded to a copper core. Only 9 examples are believed to have been struck, 2of which were offered in Heritage's January 2006 sale of the Jules Reiver collection.
Photo courtesy of Heritage.