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.

PY019.04

Country / Post Paraguay
Date of Issue 11 October 2004
Primary theme Fauna (Frogs)
Subject America 2004 - Protection of the Environment - Ceratophrys cranwelli
Width 50.0 mm
Height 40.0 mm
Denomination 6000 PYG
Number in set 2 (show set)
Layout/Format miniature sheet of 1
Perforations 6 by 6
Stamp issuing authority Correo Paraguayo
Printer Fiscal Assets Department - Asunción