Issued in 1910, this 35-para stamp from Montenegro commemorates the 50th anniversary of the Montenegrin postal service (1860–1910). It features a finely engraved portrait of Nicholas I, who ruled as Prince and later King, rendered in warm brown tones. The frame is richly ornamented with stylized oak leaves and traditional Balkan motifs, giving the design a distinct national character. This issue is part of a popular commemorative set, attractive to collectors for its strong historical significance and clean classical engraving. Well-centered examples with fresh color, like this one, remain highly sought after.