on 2 annas, initialled "A.B.", used in combination with 1890-95 4a. yellow-brown, S.G. 9, and tied by "MOMBASA/A/MR 2/91" single circle datestamps to piece; scarce. R.P.S. Certificate (1983). S.G. 23a, £950. Photo" /> on piece <I>"½ Annas"</I> on 2 annas, initialled<I> "A.B."</I>, used in combination with 1890-95 4a. yellow-brown, S.G. 9, and tied by "MOMBASA/A/MR 2/91" single circle datestamps to piece; scarce. R.P.S. Certificate (1983). S.G. 23a, £950. Photo | Christie's