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.

OM004.13

Country / Post Oman
Date of Issue 8 January 2013
Primary theme Flora (Flowers - General)
Subject Omani Environment Day - Aegopordon berardoides
Width 50.0 mm
Height 30.0 mm
Denomination 2.50 OMR
Number in set 4 (show set)
Layout/Format sheet of 12
Perforations 13 by 13
Stamp issuing authority Ministry of Transport & Communications Sultanate of Oman
Printer Cartor
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