unused "2½" on 1½a. sepia, variety "Br1tish" [120], two or three slightly thinned perfs. at foot, otherwise fine mint; rare. S.G. 64b, £900. Photo

Details
unused "2½" on 1½a. sepia, variety "Br1tish" [120], two or three slightly thinned perfs. at foot, otherwise fine mint; rare. S.G. 64b, £900. Photo