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.

SM028.06

Country / Post San Marino
Date of Issue 21 August 2006
Primary theme Post & Philately
Subject 40th Anniversary of the Italian Philatelic Press Union (U.S.F.I.)
Width 30.0 mm
Height 40.0 mm
Denomination 0.90 €
Number in set 2 (show set)
Layout/Format sheet of 20
Perforations 13 by 13
Stamp issuing authority République de Saint Marin
Printer Cartor Security Printing