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| Start / | Knowledge / |
| Imperforated | Rouletting | Perforations | Die-Cutting | Stamps with two Separation Methods | Paralell Issues | Compound Perforations |
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Knowledge / Separation Methods / Perforations |
Perforation: by this process the paper between the stamps is cut away in a line of holes and paper is removed. | ||
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gumed perforated stamps |
self-adhesive perforated stamps |
tilted perforation lines |
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perforation with stars at the stamp corners |
souvenir sheet with additional "USA" in the perforation line under the stamp |
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pair with oak leaf in between |
round perforated stamps with partly shape of a peace pigeon |
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rough perforation: unclean perforation with paper rests in the perfs |
missing perfin: caused by a broken perforation pin (error) |
with additional diagonal perforation. each half could be used as ½ centavo stamps |
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with additional vertical perforation (error) |
coil stamps with wide (left) and narrow tooth (right) at the left stamp |
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alternating perforation: one small and one wider hole alternately in the perforation lines |
coil perforation: with irregularities in the perforation (syncopated perfs) |
rhomb-shaped perforation: with rhomp-shaped instead of round perforation pins |
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security perforation: oval perforation hols to prevent counterfeiting |
diamond perforation: stamps with a double perforation (error) |
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