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 Sri Lanka in 2011

The 2011 issuing programme is not available.
  1. Lk051.11-80
    Wns Number
    LK051.11
    Country / Post
    Sri Lanka
    Date of Issue
    October 28, 2011
    Subject
    Vintage and Classic Cars of Sri Lanka - Morris Minor
  2. Lk052.11-80
    Wns Number
    LK052.11
    Country / Post
    Sri Lanka
    Date of Issue
    November 27, 2011
    Subject
    Christmas 2011
  3. Lk053.11-80
    Wns Number
    LK053.11
    Country / Post
    Sri Lanka
    Date of Issue
    November 27, 2011
    Subject
    Christmas 2011
  4. Lk054.11-80
    Wns Number
    LK054.11
    Country / Post
    Sri Lanka
    Date of Issue
    November 28, 2011
    Subject
    Most Ven. Kotagama Wachissara Thero
  5. Lk055.11-80
    Wns Number
    LK055.11
    Country / Post
    Sri Lanka
    Date of Issue
    December 01, 2011
    Subject
    World AIDS Day - 2011