£50
1932 POSTAL SEAL BLOCK OF FOUR: 1 piastre deep blue and red inscribed "POSTAL SEAL" in unmounted mint imperforate upper right corner block of four. Printer's? fingerprint in blue ink present in the margin. Unlisted as imperf. in SG (see SG A1). Possibly ex printers archive or imprimatur.Cross Reference: YORKSHIRE, UNIFORM 1d POSTAGE PERIOD
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