Although described as regular dies trial pieces, these were actually deliberately struck for sale to collectors as part of complete off-metal sets.
Examples were struck as follows:
Copper J1432/P1575 with only 4 or 5 examples believed to exist.
Aluminum J1433/P1576 with only 2 or 3 examples believed to exist.
Note: The die trials of this year are often found gilt due to the rarity of many of the gold denominations.
Photo courtesy of Heritage.