A reply pilfered from Nigelpedia...
Quote:
Montenegro was occupied by Austria in 1916 and a government in exile was set up in Bordeaux in France. SG Part 3 and Michel both list some stamps that were issued there and used for a very short period. They also note that stamps in the design you show and some others were created but not issued.
For additional stamps, info, and history, you can view the Witt Collection at
http://www.cinderellas.info/wittcol...llection.htm. Scroll down the left sidebar until you get to "Montenegro 1920-1 Govt in Exile Collection". There are 7 pages of goodies to go through.