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.


Country / Post United States of America
Date of Issue 27 January 2019
Primary theme Fauna (Butterflies)
Subject California Dogface
Width 32.0 mm
Height 32.0 mm
Denomination Non-Machineable Surcharge
Number in set 1
Layout/Format self adhesive sheet
Perforations 11 by 11
Stamp issuing authority United States Postal Service