unused 1950 perf. 12½x13½ 2½d. bright blue, fresh and fine mint. One of the major KGVI rarities. B.P.A. Certificate (1959). S.G. 157a, £4250. Photo
unused 1950 perf. 12½x13½ 2½d. bright blue, fresh and fine mint. One of the major KGVI rarities. B.P.A. Certificate (1959). S.G. 157a, £4250. Photo
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