cover 1885 (1 Jan.) envelope to England, headed "On active service. Stamps unobtainable. From 16150 Sapper H. Drake T.B. R.E. Korti", countersigned by Commanding Officer of Telegraph Section, showing bi-lingual "DONGOLA" c.d.s., "1d" handstamp and arrival c.d.s.; the envelope a little discoloured. Photo