Many thanks to Yan Wu for this wonderful cover posted from the United Nations Headquarters in New York!
The 2 lovely stamps are part of a set of six stamps issued on 5th Sept 2012 on the theme, "World Heritage - Africa". For this stamp series, the United Nations Postal Administration (UNPA) has chosen six World Heritage sites in Africa.
I had the chance to visit the UN Headquarters in New York last Dec, but alas, did not get the opportunity to visit its post office. Anyway it is a nice consolation to have this cover now! :)
UN Headquarters in New York
Sphere within a Sphere sculpture at the UN
Knotted Gun sculpture