, used with "MOMBASA/A/MR 4/(91)" single circle datestamp. Brandon Certificate (1980). S.G. 20, £750. Photo" /> used ½ Anna on 2 annas, initialled<I> "A.D."</I>, used with "MOMBASA/A/MR 4/(91)" single circle datestamp. Brandon Certificate (1980). S.G. 20, £750. Photo | Christie's