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.

SI011.19

Country / Post Slovenia
Date of Issue 22 March 2019
Primary theme Science & Technology (Time measurement)
Subject Joint issue Slovenia - Slovakia - Astronomical Clock
Width 28.0 mm
Height 45.0 mm
Denomination 1.17 €
Number in set 2 (show set)
Layout/Format sheet of 8
Perforations 13.5 by 13.25
Stamp issuing authority Post of Slovenia
Printer Cartor Security Printing France
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