used 1891 (Jan.) Mombasa Provisional, "½ Anna" in dull violet on 2a. vermilion initialled "AD", lightly cancelled with "MR/30/91" c.d.s.; minor imperfections including crease, though of fine appearance. Scarce. Photocopy of B.P.A. Certificate (1979). S.G. 20, #750. Photo