Serbia: 1916 (7 June). 10c Swiss postal stationery card via Vienna to Red Cross Bureau in Belgrade tied by Geneva datestamp and red Austrian censor cachet. Reverse three lines bi-lingual Red Cross cachet says “it is allowed to write only through / mail to prisoner of war”. Message possibly from Salonica since ‘Hotel Terminus’ address commonly found on transit mail to and from occupied Serbia. Austrian were aware of corresponding with the enemy but under to Red Cross it had to be tolerated hence the cachet is Serbian and German.
