This Bulgarian stamp, issued during World War I, features a detailed portrait of Tsar Ferdinand I (reigned 1887–1918). The dates 1915–1917 at the top commemorate Bulgaria’s involvement in the war, having joined the Central Powers in 1915. The design is framed with ornate national motifs and heraldic shields, emphasizing patriotism and state pride during a turbulent era. Printed in deep green, the stamp carries a 1 stotinka denomination, making it one of the lower values in the wartime definitive series. It is a historically significant issue, reflecting Bulgaria’s monarchy and wartime alliances.