Lot 30765 – Bulgaria. 1883 (June 9) Cover from Burgas to Constantinople, franked by 1879 7k tied by « ROPiT/BURGAS » oval ds

Bulgaria. 1883 (June 9) Cover (slightly reduced at right) from Burgas to Constantinople, franked by 1879 7k, horizontally laid paper, tied by « ROPiT/BURGAS » oval ds in greenish blue (Tchilinghirian fig. 85), with Russian ROPIT oval ds on arrival on reverse, some minor tone spots, an extraordinary usage with only three covers known (unrecorded when Tchilinghirian went to press); cert. Mikulski (1997).