on 2a. vermilion (initials "AD") from the lower right sheet corner, fine used with Mombasa c.d.s. B.P.A. Certificate (1989). Sc.31; S.G. 20, £850. Photo" /> used 1891 Mombasa Provisionals, handstamped<I> "½ Anna"</I> on 2a. vermilion (initials "AD") from the lower right sheet corner, fine used with Mombasa c.d.s. B.P.A. Certificate (1989). Sc.31; S.G. 20, £850. Photo | Christie's