1d. red-brown, ‚black plate‘ 10, QA / TD, a mint corner marginal block of sixteen showing Plate number ‚10‘ and marginal inscription, variety „Check Letters ‚P‘ converted into ‚R‘ by hand engraving on RA, RB, RC and RD, and TA re-entry, QA, QD and RA with large part, others with full original gum, a very fresh, stunning and important mint multiple. B.P.A. certificate (2013) (S.G. Cat. GBP 50‘000 (as four blocks of 4))
