unused Block of Four 6c-24c 1918 Air Post (C1-C3), center line blocks of four, 'sweated' o.g., one 16c stamp has a faint thin, otherwise fine set, Scott retail $925.00 est.

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unused Block of Four 6c-24c 1918 Air Post (C1-C3), center line blocks of four, 'sweated' o.g., one 16c stamp has a faint thin, otherwise fine set, Scott retail $925.00 est.