General Articles — Prohibited Stamps
Research, commentary and historical articles on illegal and abusive stamp issues. UPU Circulars are maintained in a separate country index.
- An Interview with the Philately Manager at the UPU | PWO
- Fraudulent Postal Stamps | PWO
- Worldwide Philatelic Observatory - Illegal Postal Stamps | PWO
- WHO MISINFORMS WHOM ON THE SUBJECT OF ILLEGAL POSTAL STAMP ISSUES?
- FIP - AGAINST THE PROHIBITED STAMP ISSUES
- La désintegration du WNS ?
- THE DECAY OF THE WADP NUMBERING SYSTEM?
- L'INVASION DES ÉMISSIONS ABUSIVES
- The Invasion of Abusive Stamp Issues
- L'Observatoire philatélique mondiale
- Worldwide Philatelic Observatory
- ILLEGAL STAMPS IN EXHIBITS AT THE NEW YORK 2016 WORLD STAMP SHOW
- The Invasion of Abusive Stamp Issues
- La WNS et les Circulaires de l'UPU en 2017
- Timbres - émissions frauduleuses
- INTERPOL - A Long Overdue Measure
- Measures to Improve the WNS and the Fight Against the Illegal Issues
- Mesures visant à améliorer le WNS
- A newly launched WNS?
- The Viruses of Stamp Collecting: Illegals and Abusives
- Illegal Stamp Issues from Uganda
- Illegal Stamp Issues from Uganda
- THE MENACE OF ILLEGAL AND ABUSIVE POSTAGE STAMPS ON PHILATELIC DEVELOPMENT IN AFRICA
- Ten Lost WNS Years
- Safeguard the Postal Stamps
- Sauvegarde des timbres-poste
- The Collapse of the WNS
- Post Offices Creating Rarities
- Illegal Stamps Jan - Mars 2023
- Illegal Stamps in 2024
- Illegal Stamps seen by UPU
- Illegal Stamps Presentation Colloquium
- WADP, WNS and the Illegal Postal Stamps - Balance Sheet 10 years later
- The WNS and the UPU Circulars are not reliable
- Sites Fighting the Illegal Stamps
- THE "EXPERTIZE" OF THE UPU EXPERTS IN ILLEGAL STAMPS
- Fighting the Illegal Stamps - Letters
- Why no images of illegals on sites
- Surveillance du Web philatelique
- Philatelic Web watch
- WNS - A quoi ça sert ?
- What is WNS Good For?