Bulgarian propaganda postcard from the First Balkan War issued in 1912 with images of Montenegrin, Serbian, Bulgarian and Greek rulers and Serb, Bulgarian and Greek patriotic slogans. Above images of Montenegrin King Nikola Petrovic Njegos and Serbian King Petar Karadjordjevic are Serb tricolor flags and below them is a slogan "Only Harmony Saves the Serbs". Borders of Serbia and Montenegro are in red color.