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.

MX018.11

Country / Post Mexico
Date of Issue 5 August 2011
Primary theme Flora (Trees)
Subject International Year of Forests
Width 40.0 mm
Height 48.0 mm
Denomination 11.50 MXN
Number in set 1
Layout/Format sheet
Perforations 13 by 13
Stamp issuing authority Servicio Postal Mexicano
Printer Talleres de Impresion de Estampillas y Valores