1978 GUERNSEY 5P AND 11P OLD PRINTS (SG161/163) PRINTERS PROOFS. Two good to fine unused upper right corner marginal imperforate blocks of four of the 5p (SG161) and 11p (SG163), the 5p slight marginal soiling, from the original printers proof sheets of 100. These sheets taken during printing to proof the plate and show manuscript notations and corrections. Sheets dated 17th and 19th July 1977 and endorsed "Corrected". Unusual. (Ref 111035).