Minor toning but an attractive and desirable example of this key rarity, much above average, with impressive provenance and associations, being the right stamp of the horizontal pair formerly in the Richardson collection (RL 6/7/1960, lot 157), which was once attached to the block of 4 in the Royal Collection. Only two sheets issued, and most were used. Accompanied with British Philatelic Association certificate (1971). (SG catalogue price: £5,000) Mint. SG 1
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