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.

EE023.06

Country / Post Estonia
Date of Issue 1 June 2006
Primary theme Fauna (Birds - General)
Subject UNICEF 60th Anniversary - Mallard (Anas platyrhynchos)
Width 36.5 mm
Height 25.0 mm
Denomination 4.40 EEK + 1.00 EEK
Number in set 1
Layout/Format sheet of 10
Perforations 13.5 by 13.5
Stamp issuing authority Estonian Post
Printer AS VABA MAA Tallinn
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