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.

CN070.12

Country / Post China (People's Rep)
Date of Issue 13 September 2012
Primary theme Science & Technology (Mathematics)
Subject Qin Dynasty Bamboo slips of Liye - Multiplication table
Width 30.0 mm
Height 50.0 mm
Denomination 1.20 CNY
Number in set 2 (show set)
Layout/Format sheet of 12
Perforations 13.5 by 13.5
Stamp issuing authority State Post Bureau China National Philatelic Corporation
Printer Beijing Postage Stamp Printing House