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.

SM006.18

Country / Post San Marino
Date of Issue 13 March 2018
Primary theme Architecture (Classical)
History (Geographical history)
Subject 50th Anniversary of the San Marino - Rab (Arbe) twinning
Width 40.0 mm
Height 30.0 mm
Denomination 1.20 €
Number in set 3 (show set)
Layout/Format sheet of 12 of 3 designs
Perforations 13 by 13.25
Stamp issuing authority République de Saint Marin
Printer Cartor Security Printing