http://www.invaluable.co.uk/auction-lot/1913-1d-scarlet-vermilion-wmk-royal-cypher,-varie-1987-c-abf4a1aa911913 1d scarlet-vermilion Wmk Royal Cypher, variety 'PRINTED ON THE BACK' UM block of four, SG.361a, Cat. £1800++
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