Lot 90109 – 20pa. blue, perf. 12 1/2 x 13 1/3, mint top right corner sheet marginal rejoined block of twelve

20pa. blue, perf. 12 1/2 x 13 1/3, mint top right corner sheet marginal re-joined block of twelve, pos. 5 showing the “exploded star” plate flaw, top margin shows thick blue printed guidelines, fresh, very fine and an extremely rare multiple, one of the largest recorded blocks and a unique positional showpiece; ex Lars Alund (left block of six).