On 11 June 1993, Mountainous Karabakh started to issue own postage stamps. In English the name of country is given mostly as MOUNTAINOUS KARABAKH, only sometimes as NAGORNO-KARABAKH. The most common shortform is NKR (for Nagorno Karabakh Republic). However, caused by its unsettled status, NKR cannot become a member of UPU. Nevertheless, in present-day NKR it is not possible to use postage stamps of Azerbaijan.
The common languages on postage stamps of Mountainous (Nagorno) Karabakh are Armenian (Armenian writing) and English (Latin writing).
http://home.arcor.de/gert.bundesmann/english/philately/nkr.htm
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