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.

MX023.11

Country / Post Mexico
Date of Issue 18 August 2011
Primary theme Education
Subject 30th Anniversary of the National Institute for Adult Education
Width 24.0 mm
Height 40.0 mm
Denomination 7.00 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