6c-24c 1918-23 Air Post (C1-C6). C4 with faults (not counted), others well-centered, fresh colors, the C6 with huge Jumbo margins and perfect centering, Extremely Fine, No. C5 with 2007 P.S.E. certificate (OGph 90) and C6 2007 P.S.E. certificate (OGph 98J), according to the P.S.E. Population Report this C6 is the only hinged example to have been awarded this very high grade with none higher

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