 |
 |
 |
|
 |
|
 |
| Start / | Knowledge / | Safety Measures / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
 |
Knowledge / Safety Measures / Silk Threads / Parallel Issues |
Silk thread parallel issue: the same postage stamps issued at the same time with different silk threads |
|
Silk thread position parallel issue: the same postage stamps issued at the same time with the same silk thread in different positions |
Silk thread quantity parallel issue: the same postage stamps issued at the same time with the same silk thread in different quantities |
    |
    |
Postage stamps with the same silk thread at top or in the middle |
Postage stamps with once or without silk thread |
 |
 |