Here is first in my collection and the first airmail label issued in Cambodia.
Cambodia, officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia. With a total landmass of 181,035 square kilometres (69,898 sq mi), it is bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, and the Gulf of Thailand to the southwest. (wikipedia)
Year: 1959, Ungummed. Gummed. Günter Mair's catalogue no: - CMB-A-1, perforated 11 ½ , but mine is
perforated 10 ¼ , sheets, black/light blue-grey, 3***