Britain’s Twopenny Blue accompanied the Penny Black in the 1840 postal reform. This connected block of thirty-eight unused plate-one stamps is identified by the National Postal Museum as the largest surviving block from that plate. George V bought it in the 1920s for the Royal Philatelic Collection. The block was later selected for the Royal collection exhibition opening at the National Postal Museum on 6 April 2004. Its survival as a large connected multiple, and its documented royal collection history, distinguish it from individual used or unused examples of the same issue.