These are so-called regular dies trial pieces but most of these off-metal coins were deliberately struck for sale to collectors often as part of complete sets.
Examples are known in the following combinations:
Copper or Bronze on thick planchets J403/P471 Metallurgical analysis is recommended. These may simply be mint errors struck on wrong thickness stock. Only 2 or 3 are believed to exist.
Copper or Bronze with reeded edge J403A/P472 These supposedly exist on both thick and thin planchets. Pollock lists 2 ands a third, on thick planchet, appeared in Stacks-Bowers 6/11 sale.
Copper-nickel J404/P473. These exist on both thin 47 grain and thick 72 grain planchets with the latter probably being mint errors struck on leftover planchets for pre 1864 Indian Cents.
Copper-nickel with reeded edge J405/P474. These exist on both thin 47 grain and thick 72 grain planchets with the latter probably being leftover planchets for pre 1864 Indian Cents.
Nickel J406 & J406A/P475-P476. These have been traditionally described as silver-nickel but this is unlikely per the research of David Cassel with regard to other silver-nickel patterns. Pollock separates these based on there being two obverse dies for these with different date placements. On P475 the point of Liberty's bust is to the left of the '1' in date. On P476 the point of Liberty's bust is even with the left edge of the '1' in date as on the illustrated example. Metallurgical analysis is recommended.
Photo courtesy of Superior.