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.

BG023.08

Country / Post Bulgaria
Date of Issue 9 June 2008
Primary theme Astronomy & Space (Astronauts & Cosmonauts)
Subject 20th Anniversary of A.Alexandrov's Flight in Space
Width 43.0 mm
Height 32.0 mm
Denomination 1.00 BGL
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