Edit: On the re-engraved 3c design of 1873, the shading around the central oval is about half the previous width and there is a horizontal dash about a millimeter below the TS in CENTS.
The banknotes are particularly challenging. They were printed by 3 different companies with the differentiation being the secret marks, paper type or the color shade. Additionally they were re-engraved in 1881-82 for some of the values. They were also reprinted by both Continental and American Bank Note Co.
Actually the 24 cent National and Continental share the same cat number unless it is printed on ribbed paper as no one wants to certify the Contenental 24 cent silk paper.
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