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| Start / | Knowledge / | Separation Methods / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Safety Measures | Quality |
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Knowledge / Separation Methods / Perforations / Kinds |
Perforation kind: summary of the different intended styls of a perforation |
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With perforation: postage stamp issued with perforation as intended style |
Without perforation: postage stamp issued without perforation as intended style. This will only be shown when the same postage stamp was also issued with perforation |
Partly without perforation: postage stamp issued partly without perforated as intended style |
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Missing perforation hole: perforation with incomplete perforation lines as intended style |
Provisional perforation: postage stamp with provisional perforation |
Official perforation: postage stamp with perforation ordered by a public postal administation |
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Private perforation: postage stamp with perforation ordered by a private person or company |
Local perforation: postage stamp with perforation issued for a local area e. g. city (postmaster perforation) |
Printed perforation: postage stamp without separation with a hint of printed perforation around the design print |
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Printed perforation holes: postage stamp without separation with indicated printed tooth holes around the design print |
Additional perforation: postage stamp with additional perforation in order to use them proportionately as intended style |
Perforation number: number of perfor-ated holes on a postage stamp measured per 2 centimeters of length (e.g. 14) |
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Compound perforation: postage stamp provided with perforation with different perforation numbers as intended style (e.g. 14 : 13¾) |
Compound perforation 6½ : 12½ : 12½ : 6½ |
Fluctuating number of teeth: postage stamp with uneven distance between the teeth as intended style |
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Alternating perforation: perforation in which smaller and larger holes alternate in the perforation lines |
Coil perforation: perforation with missing perforation holes to prevent accidental sepa-ration of the postage stamps in the machine |
Island perforation: sheet with one or more free-standing postage stamps without perfor-ation between the stamps or the margin of sheet |
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Test perforation: testing through an experi-ment whether a postage stamp can be perforated |
Level out tooth: correction tooth that deviates from the standard width and is used to compensate for the further movement of the teeth into the design print due to production |
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Perforation with crease separation: perforated postage stamps that were separated by folding and tearing |
Perforation with cutting separation: per-forated postage stamps that were separated with a cutting tool (e.g. scissors) |
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Comb perforation: all postage stamps in a horizontal row are perforated on three sides at the same time |
Double comb perforation: all postage stamps in a horizontal row are perforated on either four or three sides at the same time |
Cross-comb perforation: all postage stamps in a horizontal row are perforated horizontally on one side and half perforated vertically in two rows |
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Double cross-comb perforation: all postage stamps from two horizontal rows are perforated on one or two sides horizontally and completely or half vertically |
Harrow perforation: all postage stamps on a sheet are perforated on all four sides at the same time (sheet perforation) |
Spezial comb perforation: all postage stamps from two horizontal rows of different sizes are perforated on three or four sides at the same time (Swedish perforation) |
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Line perforation: all postage stamps on a sheet are first perforated horizontally and then vertically. The canines of the individual postage stamps are irregular |
Grinding perforation: the paper is pressed with pins onto a rapidly rotating roller so that round holes are ground out of the paper |
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