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.

BG004.18

Country / Post Bulgaria
Date of Issue 20 March 2018
Primary theme Politics & Government (Independence)
Military (Military events)
Subject Joint Issue Bulgaria-Russia - 140th Anniversary of the Russian-Turkish War of Liberation
Width 43.0 mm
Height 53.0 mm
Denomination 1.00 BGN
Number in set 2 (show set)
Layout/Format miniature sheet of 2 of 2 designs
Perforations 13 by 13
Stamp issuing authority Bulgaria Posts PLC
Printer Bulgarian Philately and Numismatics