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.

SK013.19

Country / Post Slovakia
Date of Issue 7 June 2019
Primary theme Science & Technology (Mathematics)
Subject The International Mathematics Olympiad
Width 26.5 mm
Height 44.1 mm
Denomination 1.25 €
Number in set 1
Layout/Format sheet of 50
Perforations 14 by 14
Stamp issuing authority Slovak Post
Printer Tiskárna Hradistko s r o
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