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.

BG021.16

Country / Post Bulgaria
Date of Issue 22 September 2016
Primary theme Architecture (Classical)
Subject Joint Stamp Issue Bulgaria-Azerbaijan - Archeological Reserve Trapezitsa - Heydar Aliyev Foundation
Width 44.0 mm
Height 29.0 mm
Denomination 1.50 BGN
Number in set 1
Layout/Format miniature sheet of 1
Perforations 13.5 by 13.5
Stamp issuing authority Ministry of Transport, Information Technologies & Communications
Printer Bulgarska Philatelia & Numismatika