These are the regular dies trial pieces for the 1858 flying eagle cent.
They were struck as follows:
Small Letter Obverse
Copper J217/P239 with only 2 confirmed, both business strikes which circulated including the one illustrated above ex Superior 2002 ANA, Heritage 1/12 FUN.
Photo courtesy of Superior.
Nickel or German Silver J217A/P240 with only 4 or 5 known including the Eliasberg, ANR 3/05 piece illustrated below courtesy of American Numismatic Rarities.
Large Letter Obverse
Copper J218/P231 with only 2 or 3 known. The first appearance for this is apparently lot 911 in H. Chapman's 7/22 sale.
Nickel or German Silver J218A/P232 with only 2 or 3 known.