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.


Country / Post Bulgaria
Date of Issue 20 April 2018
Primary theme Post & Philately
Subject 125th Anniversary of Plovdiv Philately Association - The beginning of the organized philatelic movement in Bulgaria
Width 29.0 mm
Height 54.0 mm
Denomination 1.50 BGN
Number in set 1
Layout/Format miniature sheet of 1
Perforations 13 by 13
Stamp issuing authority Bulgaria Posts PLC
Printer Bulgarian Philately and Numismatics