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 15 February 2019
Primary theme Flora (Cactus)
Subject Cactus Flowers - Opuntia engelmannii
Width 30.0 mm
Height 23.0 mm
Denomination Forever
Number in set 10 (show set)
Layout/Format self adhesive booklet of 20 of 10 designs
Perforations imperforate by 11
Stamp issuing authority United States Postal Service