6c-24c 1918-23 Air Posts (C1-C6). Mint N.H. blocks of four, with additional Nos. C4 (two stamps lightly hinged) and C6, bright colors except No. C1 slightly oxidized, Fine-Very Fine, one No. C4 with 2001 P.S.E. certificate for block of eight from which it originated, Scott Retail as singles

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