24c Carmine Rose & Blue, 1918 Air Post (C3).
Bottom left corner selvage block of four with "S. De B." siderographer's initials
(Samuel De Binder), three stamps Mint N.H., bottom right lightly hinged and also hinged in top selvage, well-centered, Very Fine and choice position piece from the scarce first printing, in which the bottom selvage was retained and the top plate number selvage was removed -- in response to the discovery of the invert error, the word "TOP" was added to the vignette and frame plates and printed in the top selvage, and the perforating/trimming process was modified to leave the top selvage intact and remove the bottom selvage with the DeBinder's initials
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