The World Association for the Development of Philately (WADP) and the Universal Postal Union (UPU) jointly conceived and developed the WADP Numbering System - WNS, which was launched on 1 January 2002.

Philatelic circulars

Circulars are issued on a range of stamp-related subjects, for example reporting illegal issues, promoting the issuing of stamps in connection with major humanitarian causes, and informing member countries about intellectual property issues relating to major international events.

Last Circulars Published:

30-01-2017 Circular no.19/2017
Rwanda - Illegal issues
30-01-2017 Circular no.18/2017
Croatia - Illegal issues
21-03-2016 Circular no.38/2016
Kiribati – Illegal issues