6c Ultramarine & Carmine (C23c). Mint N.H. top plate nos. 21910 and F21951, double "TOP" and registration marker block of four, brilliant colors in these distinct shades, each stamp with light pencil position in corner and small purple Bruechig backstamp

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

Apart from a complete pane of 50 (which contained one plate block), we have offered only two other plate blocks of Scott C23c since keeping computerized records.

With 2018 P.S.E. certificate (VF 80). Scott value is out of date as a similar example we offered in Sale 1192 (lot 702) realized $7,500 hammer, versus Scott value of $1,500.00

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