Belgian Congo Postage stamp, 1918 issue with a + 50c red overprint on a 50 c (1915 issue) for the Red Cross. COB N°77
Belgium / Belgian Congo Post Office
1918
Hi-res scan of postage stamp by <a href="//commons.wikimedia.org/wiki/User:Gwillhickers" title="User:Gwillhickers"><i>Gwillhickers</i></a>.