It was launched on 1 January 2002 .
The Universal Postal Union , in conjunction with the World Association for the Development of Philately , developed the WADP Numbering System ( WNS ) .
Universal Postal Union was launched on 1 January 2002 .
The Universal Postal Union , in conjunction with the World Association for the Development of Philately , developed the WADP Numbering System ( WNS ) .