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:

04-12-2017 Circular no.157/2017
Egypt – Illegal issues
04-12-2017 Circular no.158/2017
Libya – Illegal issues
30-01-2017 Circular no.19/2017
Rwanda - Illegal issues
30-01-2017 Circular no.18/2017
Croatia - Illegal issues
25-07-2016 Circular no.123/2016
World Tourism Organization – International Year of Sustainable Tourism for Development
18-07-2016 Circular no.121/2016
Isle of Man – Illegal stamp issues
21-03-2016 Circular no.38/2016
Kiribati – Illegal issues
21-03-2016 Circular no.39/2016
Madagascar – Illegal postage stamps
21-03-2016 Circular no.40/2016
Namibia – Illegal issues
21-09-2015 Circular no.149/2015
Trinidad and Tobago – Illegal issues
21-09-2015 Circular no.150/2015
Cambodia – Illegal issue
25-05-2015 Circular no.79/2015
Mali – Illegal postage stamps
11-05-2015 Circular no.64/2015
Food and Agriculture Organization – 70th Anniversary
11-05-2015 Circular no.65/2015
Namibia – Illegal issues of postage stamps
11-05-2015 Circular no.66/2015
Malawi – Illegal issues of postage stamps
16-03-2015 Circular no.41/2015
Viet Nam – Further statement on UPU International Bureau circular No. 30 of 24 February 2014
16-03-2015 Circular no.42/2015
Russian Federation – Illegal issue of postage stamps
16-02-2015 Circular no.28/2015
UNESCO – 70th Anniversary
02-02-2015 Circular no.14/2015
Vatican – Protection of copyright and rights of image
02-02-2015 Circular no.15/2015
Lesotho – Illegal stamps