Lot 51181 – 1918 War Tax 1/2d with DOUBLE OVERPRINT variety in mint n.h. block of 20

1918 War Tax 1/2d with DOUBLE OVERPRINT variety in mint n.h. block of 20 from the lower left corner of the right pane, some perf. separation, very fine, probably the largest known multiple of this error (larger than the block of 18 in the Kayfetz sale which was described as the largest), an exhibition showpiece, ex “Tatiana”, cert. BPA (1993) (SG £18’000+).