Optical Coincidence Errors: When Two Separate Printing Defects on the Same Note Accidentally Align Into a One-of-a-Kind Artifact
Some of the rarest and most visually striking error notes in existence are not the result of a single printing mishap, but two independent defects that happen to interact on the same piece of paper. Understanding optical coincidence errors unlocks a fascinating corner of error note collecting where rarity compounds upon rarity.
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