unused  "2½" (Type 4) on 2a. dull blue showing small "z", fine mounted mint. S.G. 39, £170. Photo
unused "2½" (Type 4) on 2a. dull blue showing small "z", fine mounted mint. S.G. 39, £170. Photo

Details
unused "2½" (Type 4) on 2a. dull blue showing small "z", fine mounted mint. S.G. 39, £170. Photo