This year is known only for the 39 examples of the new Sacagawea dollar that were struck in 22 karat gold J2190 at West Point as a prelude to the Mint's eventual offering of a precious metal gold version of the "golden dollar" for collectors.
These meet the criteria as a trial piece although they are more accurately described as presentation pieces.
A dozen of these coins went into orbit on the space shuttle Columbia on July 23, 1999 and still exist. The others were melted.
Photo courtesy of the U.S. Mint.
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