6c Red on Buff, Die 10, Cut Square (U31; UPSS 63). Unused, 28 x 33mm, narrow diagonal sealed tear at bottom right far from indicia, Very Fine appearance and scarce, fewer than five mint entires are recorded, we have offered only two other cut squares outside of this sale in more than 25 years and both measured smaller than this example, with 2020 P.F. certificate

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