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.

BG005.11

Country / Post Bulgaria
Date of Issue 11 April 2011
Primary theme Politics & Government
Subject 20 Years Atlantic Club in Bulgaria
Width 43.0 mm
Height 32.5 mm
Denomination 1.00 BGL
Number in set 1
Layout/Format miniature sheet of 1
Perforations 12.5 by 12.5
Stamp issuing authority Bulgaria Posts PLC
Printer Bulgarian Philately and Numismatics