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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Stamped Envelope Overprints / Changes |
Stamped envelope overprint change: the same stamped envelopes issued chronologic with different stamped envelope overprints |
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Stamped envelope overprint colour change: the same stamped envelopes issued chronologic with the same stamped envelope overprints in different colours |
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Edition 1863: green stamped envelope overprint |
Edition 1874: black stamped envelope overprint |
Stamped envelope overprint position change: the same stamped envelopes issued chronologic with the same stamped envelope overprint in different positions |
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Edition 1861: stamped envelope overprint beside stamp impression |
Edition 1862: stamped envelope overprint throught stamp impression |
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