1978 GUERNSEY 5p AND 11p OLD PRINTS (SG 161/163) IMPERFORATE CORNER BLOCKS OF FOUR WITH PLATE CORRECTION ANNOTATIONS. Two fine unused upper left corner marginal imperforate blocks of four 1978 Guernsey 5p (SG161) and 11p (SG163), former with paper fold prior to printing, from the original printer's sheets of 100 taken during printing to proof the plate with manuscript notations and corrections. Sheets dated 17.9.77 and 19.7.77 and endorsed 'Corrected'. Unusual. (Ref 39266).
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