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Overprints A T Ms Additional Stamp
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lations
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Perforations
Se-tenants Second Overprints Others

Knowledge / Errors / Perforations

Perforation Error: philatelic term for a deviation caused by a perforation error

Missing Perforation: postage stamp without perforation at all sides caused by an error

Partly Missing Perforation: postage stamp with missing perforation at one or more, but not at all four, sides caused by an error

Pair With Missing Perforation in Between: pair with missing perforation in between caused by an error

Block of 4 With Missing Perforation in Between: sheet part with missing perforation in between caused by an error

Inverted Perforation: sheet with 180 degrees rotated perforation

Double Perforation: postage stamp twice perforated at all sides

Partly Double Perforation: postage stamp twice perforated at one or more, but not at all four, sides

Perforation Size Error: postage stamp with a different number of perforation elements at all four sides caused by an error

Partly Perforation Size Error: postage stamp with a different number of perforation elements at one or more, but not at all four, sides caused by an error

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