Issued in 1962 by the United Nations Postal Administration, these two stamps highlight the UN’s efforts in promoting economic and social progress through the Lower Mekong Basin Development Project. The design features transmission towers, a sailing boat, and a map of the Mekong region — symbolizing regional cooperation, hydroelectric development, and modernization across Southeast Asia. The denominations of 6¢ (blue) and 13¢ (maroon) represent the English and French inscriptions respectively. These issues commemorate the United Nations’ support for sustainable development and international partnership in the Mekong region.