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.

US005.17

Country / Post United States of America
Date of Issue 27 January 2017
Primary theme National symbols (Flags)
Subject US Flag
Width 24.0 mm
Height 26.0 mm
Denomination Forever
Number in set 3 (show set)
Layout/Format self adhesive booklet of 20 & 10
Perforations imperf by 12
Stamp issuing authority United States Postal Service
Printer