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. Lk011.11-80
    Wns Number
    LK011.11
    Country / Post
    Sri Lanka
    Date of Issue
    March 02, 2011
    Subject
    60th Anniversary of Sri Lanka Air Force
  2. Lk012.11-80
    Wns Number
    LK012.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 01, 2011
    Subject
    Daul Drummer - Surcharged issue
  3. Lk013.11-80
    Wns Number
    LK013.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 01, 2011
    Subject
    Daul Drummer - Surcharged issue
  4. Lk014.11-80
    Wns Number
    LK014.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 26, 2011
    Subject
    50 Years since First Man in Space - Yuri Gagarin
  5. Lk015.11-80
    Wns Number
    LK015.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 29, 2011
    Subject
    2600th Sambuddhatva Jayanthi
  6. Lk016.11-80
    Wns Number
    LK016.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 29, 2011
    Subject
    2600th Sambuddhatva Jayanthi
  7. Lk017.11-80
    Wns Number
    LK017.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 29, 2011
    Subject
    2600th Sambuddhatva Jayanthi
  8. Lk018.11-80
    Wns Number
    LK018.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 29, 2011
    Subject
    2600th Sambuddhatva Jayanthi
  9. Lk019.11-80
    Wns Number
    LK019.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 29, 2011
    Subject
    2600th Sambuddhatva Jayanthi
  10. Lk020.11-80
    Wns Number
    LK020.11
    Country / Post
    Sri Lanka
    Date of Issue
    April 29, 2011
    Subject
    2600th Sambuddhatva Jayanthi