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. Lk001.11-80
    Wns Number
    LK001.11
    Country / Post
    Sri Lanka
    Date of Issue
    January 18, 2011
    Subject
    125th Anniversary of Labugama Resevoir & Water Purification Plant
  2. Lk002.11-80
    Wns Number
    LK002.11
    Country / Post
    Sri Lanka
    Date of Issue
    January 21, 2011
    Subject
    Centenary of Birth of Dr P.R. Anthonis
  3. Lk003.11-80
    Wns Number
    LK003.11
    Country / Post
    Sri Lanka
    Date of Issue
    January 30, 2011
    Subject
    International Year of Chemistry
  4. Lk004.11-80
    Wns Number
    LK004.11
    Country / Post
    Sri Lanka
    Date of Issue
    February 02, 2011
    Subject
    25th Anniversary of Viceroy Special Steam Train
  5. Lk005.11-80
    Wns Number
    LK005.11
    Country / Post
    Sri Lanka
    Date of Issue
    February 02, 2011
    Subject
    25th Anniversary of Viceroy Special Steam Train
  6. Lk006.11-80
    Wns Number
    LK006.11
    Country / Post
    Sri Lanka
    Date of Issue
    February 02, 2011
    Subject
    25th Anniversary of Viceroy Special Steam Train
  7. Lk007.11-80
    Wns Number
    LK007.11
    Country / Post
    Sri Lanka
    Date of Issue
    February 02, 2011
    Subject
    25th Anniversary of Viceroy Special Steam Train
  8. Lk008.11-80
    Wns Number
    LK008.11
    Country / Post
    Sri Lanka
    Date of Issue
    February 02, 2011
    Subject
    25th Anniversary of Viceroy Special Steam Train
  9. Lk009.11-80
    Wns Number
    LK009.11
    Country / Post
    Sri Lanka
    Date of Issue
    February 06, 2011
    Subject
    175th Anniversary of St Mary's Church, Dehiwala
  10. Lk010.11-80
    Wns Number
    LK010.11
    Country / Post
    Sri Lanka
    Date of Issue
    February 18, 2011
    Subject
    125th Anniversary of Southlands College, Galle