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.

EC031.16

Country / Post Ecuador
Date of Issue 14 November 2016
Primary theme Geography & Meteorology (Maps & Cartography)
Minerology & Geology (Mountains & Geological features)
Subject 3rd Geodesic Mission France - Ecuador (1736 - 1901 - 2016)
Width 38.0 mm
Height 28.0 mm
Denomination 0.10 USD
Number in set 2 (show set)
Layout/Format sheet of 100
Perforations 14 by 14
Stamp issuing authority Correos del Ecuador CDE EP
Printer Instituto Geográfico Militar