 |
 |
 |
|
 |
|
 |
| Start / | Knowledge / | Separation Methods / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Safety Measures | Quality |
 |
Knowledge / Separation Methods / Perforations / Parallel Issues |
Perforation Parallel Issue: the same postage stamps issued at the same time with different perforations |
||
Perforation Size Parallel Issue: the same postage stamps issued at the same time with the same perforation in different sizes |
Perforation Number Parallel Issue: the same postage stamps issued at the same time with the same perforation in different numbers |
|
    |
    |
|
the same postage stamps with different distance between the perforation lines |
the same postage stamps with fine or coarse perforation |
|
Perforation Kind Parallel Issue: the same postage stamps issued at the same time with different perforation kinds |
Partly Perforation Kind Parallel Issue: the same postage stamps issued at the same time with partly different perforation kinds |
|
   |
 |
  |
sheet stamps with comb perforation |
special sheet stamps with harrow perforation |
the same postage stamps with with four-sided comb perforation or with three-sided comb perforation and one-sided line perfor-ation (left side) |
Perforation Quality Parallel Issue: the same postage stamps issued at the same time with different perforation qualities |
Perforation Position Parallel Issue: the same postage stamps issued at the same time with the same perforation in different positions |
Perforation Quantity Parallel Issue: the same postage stamps issued at the same time with the same perforation in different quantities |
    |
  |
 |
the same postage stamps with the same perforation in different qualities |
the same postage stamps with the same perforation in different positions |
the same postage stamps with the same perforation once or twice |
 |
 |