1912, 1½d. red-brown, marginal horiz. pair from the lower left corner of the sheet with control ”N 19”, on R20/2 ”Top frame damaged”, in addition plate block of six without that variety but instead on R19/2 ”weak SE corner”, both unmounted mint. SG spec. N18n, £275 for m/m, estimated to £400 ++ for u/m (this is the price for the single listed variety, no surplus for units/controls/the other particularity!). Very attractive and instructive group!