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.

BG010.11

Country / Post Bulgaria
Date of Issue 30 April 2011
Primary theme History (Archeology)
Religions & beliefs (Christianity)
History (History of Peoples)
Subject 1700th Anniversary of the Serdica Edict of Religious Tolerance issued by Emporer Gallius
Width 53.5 mm
Height 29.0 mm
Denomination 0.65 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