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.

BG001.11

Country / Post Bulgaria
Date of Issue 7 January 2011
Primary theme Geography & Meteorology (Artic and Antarctica)
Fauna (Mammals)
Subject Antarctica
Width 33.0 mm
Height 22.0 mm
Denomination 0.58 BGL
Number in set 1
Layout/Format sheet of 100
Perforations 12.5 by 12.5
Stamp issuing authority Bulgaria Posts PLC
Printer Bulgarian Philately and Numismatics