Vintage Poster Stamp inscribed “Просветница / Prosvetnica” and “Кајмакчалан / Kajmakcalan”, dated 1918–1928. The red monochrome design is divided into two scenes beneath decorative arches. On the left is a symbolic depiction of fallen soldiers (skulls), commemorating the battles at Kajmakcalan during the First World War. On the right stands a memorial chapel with a group of people gathered in remembrance. The denomination “1” appears in both upper corners. This Poster Stamp was issued to commemorate the 10th anniversary (1918–1928) of the liberation and the battles of Kajmakcalan, combining patriotic remembrance with cultural or educational fundraising.

Inscription: Prosvetnica / Kajmakcalan
Denomination: 1
Country: Kingdom of Yugoslavia (former Serbia)
Event: 10th anniversary commemoration of the Battle of Kajmakcalan (World War I)
Date: 1928
Language: Serbian (Cyrillic and Latin script)