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.

ZA055.13

Country / Post South Africa
Date of Issue 8 August 2013
Primary theme Minerology & Geology (Mountains & Geological features)
Subject Rock Formations and the Cederberg
Width 65.0 mm
Height 26.0 mm
Denomination International Small Letter
Number in set 10 (show set)
Layout/Format self adhesive miniature sheet of 10 of 10 designs
Perforations 14 by 14
Stamp issuing authority South African Post Office
Printer Lowe Martin Group