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

Knowledge / Accidentals / Perforations

Accidental Perforation: philatelic term for an accidental perforation

Shifted Perforation: deviation from the intended perforation position

Misperforated Postage Stamp: shifted perforation split on multible postage stamps

Sheet Turn-Over: paper sheet turned over before perforation

Blind Perforation: perforation with not fully punched holes

Partly Blind Perforation: perforation with not fully punched holes at one or more, but not at all four, sides

Missing Perforation Hole: perforation with a missing hole caused by a broken perforation pin

Oblique Perforation: postage stamp with perforation shifted out of alignment

Oblique Perforation: postage stamp with perforation shifted out of alignment

Rough Perforation: imperfect perforation with paper rest in the holes

Irregular Perforation: perforation with holes not in a line

Perforation Size Difference deviation from the intended size of a perforation

Level Out Tooth: from the standard deviate tooth to avoid misperforated postage stamps

Straggering Perforation: perforation with uneven space between the holes

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