cover -- 10c. black, stationery card (1889 issue) addressed to Leopoldville, message on reverse headed "Bolobo le 2 Fevrier 91" and showing fine strike of large purple circular "CONGO MOYEN/flag/BOLOBO" cachet adjacent, cancelled on arrival by black "LEOPOLDVILLE/3/MARS/1891" c.d.s., a few hinge nmarks on front and a few tiny stain spots, still fine and rare. Thought to be one of two known strikes on entires. Photo