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.

AU022.17

Country / Post Australia
Date of Issue 2 May 2017
Primary theme Minerology & Geology (Mountains & Geological features)
Subject Caves - Undara Cave Lava Tube, QLD
Width 37.5 mm
Height 26.0 mm
Denomination 2.00 AUD
Number in set 4 (show set)
Layout/Format sheet of 50
Perforations 13.86 by 14.6
Stamp issuing authority Australia Post
Printer RA Printing
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