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.

SM009.15

Country / Post San Marino
Date of Issue 10 March 2015
Primary theme Holy Days & Celebrations (Personal Celebrations)
Subject International Day of Happiness
Width 48.0 mm
Height 40.0 mm
Denomination 0.95 €
Number in set 2 (show set)
Layout/Format sheet of 20
Perforations 13.25 by 13
Stamp issuing authority République de Saint Marin
Printer Cartor Security Printing