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.

BG020.18

Country / Post Bulgaria
Date of Issue 26 September 2018
Primary theme Transportation (Rail) (Locomotive & trains)
Engineering (Bridges)
Subject 130th anniversary of Bulgarian State Railways
Width 43.0 mm
Height 32.0 mm
Denomination 0.65 BGN
Number in set 4 (show set)
Layout/Format sheet of 45, miniature sheet of 4 of 4 designs
Perforations 13 by 13
Stamp issuing authority Ministry of Transport, Information Technologies & Communications
Printer Bulgarska Philatelia & Numismatika