-1/2p Green, Imperforate at Base (BW 1b).
Bottom left corner margin CA monogram block of six,
the bottom three stamps being the error, as they are completely imperforate between the stamps and sheet selvage, top three stamps lightly hinged, bottom three stamps Mint N.H., single mild h.r. in bottom sheet selvage, lightly folded along center row of horizontal perforations
FINE-VERY FINE. AN IMMENSELY RARE AND IMPORTANT CA MONOGRAM BLOCK OF SIX DISPLAYING THE IMPERFORATE AT BASE ERROR. OF THE FOUR RECORDED MONOGRAM PIECES WITH THIS ERROR, ONLY TWO REMAIN IN PRIVATE HANDS -- THE BLOCK OFFERED HERE FROM THE FAMOUS ARTHUR GRAY COLLECTION AND THE BLOCK SOLD IN THE 2005 SIR GAWAINE BAILLIE SALE.
Ex Gray and Lord Steinberg
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