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.

BG006.15

Country / Post Bulgaria
Date of Issue 20 February 2015
Primary theme Astronomy & Space (Astronauts & Cosmonauts)
Subject 40th Anniversary of the joint Space Flight "Soyuz-Apollo"
Width 39.0 mm
Height 28.5 mm
Denomination 0.65 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