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.

All registered stamps issued by United States of America in 2019

The 2019 issuing programme is not available.
  1. Us091.19-80
    Wns Number
    US091.19
    Country / Post
    United States of America
    Date of Issue
    August 29, 2019
    Subject
    Tyrannosaurus rex
  2. Us092.19-80
    Wns Number
    US092.19
    Country / Post
    United States of America
    Date of Issue
    August 29, 2019
    Subject
    Tyrannosaurus rex