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.

EC003.17

Country / Post Ecuador
Date of Issue 31 March 2017
Primary theme Fauna (Insects - General)
Subject Ecuador Ants I - Atta cephalotes
Width 28.5 mm
Height 30.0 mm
Denomination 0.25 USD
Number in set 16 (show set)
Layout/Format self adhesive miniature sheet of 8 of 8 designs
Perforations imperforate
Stamp issuing authority Correos del Ecuador CDE EP
Printer Instituto Geográfico Militar