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.

CZ008.17

Country / Post Czech Republic
Date of Issue 5 April 2017
Primary theme Geography & Meteorology (Seas, lakes & rivers)
Subject Beauties of our country - The Porta Bohemica
Width 45.0 mm
Height 31.0 mm
Denomination 20 CZK
Number in set 1
Layout/Format sheet of 8
Perforations 11.5 by 11.5
Stamp issuing authority Czech Post
Printer Post Printing House
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