unused Block of Four 20h. black and red on yellow handstamped in dull violet, a block of four with sheet margin at right, unused with almost full original gum; tear in margin, otherwise fine mint. Very rare, believed to be one of two known blocks. Holcombe Certificate (1990). S.G. M5B, #1600+. Photo
unused Block of Four 20h. black and red on yellow handstamped in dull violet, a block of four with sheet margin at right, unused with almost full original gum; tear in margin, otherwise fine mint. Very rare, believed to be one of two known blocks. Holcombe Certificate (1990). S.G. M5B, #1600+. Photo
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