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it is genuine unused, o.g., previously hinged, coil joint line pair (the bottom stamp NH) with stained perfs at the top and a short perf at the bottom right.
it is genuine unused, o.g., previously hinged, top margin block of four with Plate No. 20495 (the bottom stamps NH) and the top right and bottom left stamps with tiny thins.
it is genuine unused, o.g., previously hinged, lower left margin Plate No. 20865 block of four (the bottom stamps NH), the top left stamp with a laminated thin and the top stamps with tiny thin spots.