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.

EC003.16

Country / Post Ecuador
Date of Issue 31 March 2016
Primary theme Fauna (Frogs)
Subject Amphibians of Ecuador - Prince Charles Stream Tree Frog - Hyloscirtus princecharlesi
Width 33.0 mm
Height 29.0 mm
Denomination 0.25 USD
Number in set 8 (show set)
Layout/Format self adhesive booklet of 8 of 8 designs
Perforations imperforate
Stamp issuing authority Correos del Ecuador CDE EP
Printer Instituto Geográfico Militar