New Zealand. Elizabeth II. 1980 Twenty Cents. Indent Error. KM#36.1 [ 11.36g | 28.55mm ] *Visual representation of the indent error with a struck 5c comparison piece is included with this sale.

Pieter Hoek - New Zealand Error Coin Specialist: "This error is commonly referred to as the "Indent Error." It occurs when two planchets (either blank or previously struck) are inadvertently fed into the collar of the minting press simultaneously, often with differing denominations. This can happen if one planchet becomes misaligned or jammed within the hopper or another part of the machine during the striking process. As a result, the dies press the two planchets together, creating a partial blank on one side of the coin. While this type of error can occur with coins of the same size, it is particularly rare when coins of different sizes are involved. In this instance, it is most likely that the error occurred when a New Zealand 20-cent piece and a New Zealand five-cent piece blank were fed into the collar simultaneously, leading to the rare minting anomaly observed”.

NGC: “Another error involving two planchets, this occurs when they are fed inadvertently into the same collar, with one planchet only partly covering the top of the other. When the hammer die strikes this combination, the top planchet is forced into the bottom planchet, creating a depression that is shaped similar to the top planchet. A very rare type of indent occurs when a planchet intended for one denomination lands on top of a planchet from a different denomination”.