6c Ultramarine & Carmine (C23c). Mint N.H. wide top plate nos. 21911 and F21950, double "TOP" and registration marker block of four, bright fresh colors in these distinct shades, well-centered

VERY FINE AND RARE MINT NEVER-HINGED PLATE BLOCK OF THE 1938 6-CENT ULTRAMARINE AND CARMINE AIR POST ISSUE.

Each stamp lightly signed Bloch in pencil. With 2001 P.S.E. certificate.

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