SG 506c var. 1951 King George VI 2d. Marginal block of 20 from the UNIQUE POSITIONAL SHEET No. 120,308. Imperforate three sides (horizontal pair).

Great Britain 1951 King George VI 2d. red-brown.  Marginal block of twenty from the UNIQUE POSITIONAL SHEET No. 120,308.  Variety, ‘Imperforate three sides (horizontal pair)’.  This is the sheet which proves how the three sides Imperforate ocurred.  OUTSTANDING AND EXCEEDINGLY RARE.