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.

EC019.17

Country / Post Ecuador
Date of Issue 18 May 2017
Primary theme Post & Philately
Subject World Philately Day
Width 37.5 mm
Height 27.5 mm
Denomination 2.50 USD
Number in set 4 (show set)
Layout/Format sheet of 4 of 4 designs
Perforations 13 by 13
Stamp issuing authority Correos del Ecuador CDE EP
Printer Instituto Geográfico Militar