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.

EC035.17

Country / Post Ecuador
Date of Issue 27 November 2017
Primary theme Tourism (Tourist destinations)
Flora (Trees)
PUASP
Subject Tourist places - America UPAEP 2017 - Zapotillo - Loja - Guayacan Trees (Handroanthus chrysanthus)
Width 30.0 mm
Height 30.0 mm
Denomination 0.25 USD
Number in set 8 (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