6c-24c 1918-23 Air Post (C1-C6). Set of plate no. blocks of six, complete except C3 block of four with blue "Top" and plate no., C1-C2 Mint N.H., former hint of oxidation in corners and latter a block of eight (tiny ink spot on one stamp), C3 hinged, C4 Mint N.H., C5-C6 h.r. in selvage and the latter with gum bends and creases, well-centered throughout, Very Fine set

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