Although this is described as a regular dies trial piece in copper, it was actually deliberately struck for sale to collectors in sets with the other denominations of this year.
Fewer than a half dozen are believed to exist. The 2 Harry W. Bass Research Foundation examples were mis-slabbed as J1489. The regular dies trial piece has the tip of Liberty's coronet near star 7.
Judd lists these in aluminum J1494 but these are not confirmed to exist.
Photo courtesy of Heritage from the Queller-2009 FUN sale.