Here is one sent via diplomatic pouch from the American Embassy, Phnom Penh.
Arrived Washington, D.C., Sept. 1955
Scott # 14
Miss Garnett spent thirteen months in Cambodia in 1955-1956 working for the International Cooperation Administration as an education consultant. Much of this collection is the result of her work in Cambodia and her continuing interest in that country.https://scua.library.uni.edu/classi...ca-1955-1979
The International Cooperation Administration (ICA) was a United States government agency operating from June 30, 1955 until September 4, 1961, responsible for foreign assistance and 'nonmilitary security' programs. It was the predecessor of the present-day U.S. Agency for International Development.