In philately, an invert error occurs when part of a stamp is printed upside-down. Inverts are perhaps the most spectacular of postage stamp errors, not only because of their striking visual appearance, but because some are quite rare, and highly valued by stamp collectors.
In philately, an invert error occurs when part of a stamp is printed upside-down. Inverts are perhaps the most spectacular of postage stamp errors, not only because of their striking visual appearance, but because some are quite rare, and highly valued by stamp collectors.
Source: Wikipedia "Invert error" · CC BY-SA 4.0
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