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.

SI007.09

Country / Post Slovenia
Date of Issue 27 March 2009
Primary theme Post & Philately (Stamps on stamps)
Subject 90 Years of Chainbreaker stamps - Draft for Postage Due stamp
Width 37.5 mm
Height 52.5 mm
Denomination 0.23 €
Number in set 1
Layout/Format sheet of 16
Perforations 12.5 by 12.5
Stamp issuing authority Post of Slovenia
Printer Postovni tiskarna cenin Praha a s
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