metallic ink. On 9 March 1999, the second Castle series was replaced by four Machin stamps printed in intaglio from a gravure by Czesław Słania. References and sources Notes Sources The First Elizabeth II Castle High Value Definitives, publication #11 of the British Philatelic Bulletin, published by Royal Mail, 2005, 20 pages. Yvert et Tellier (1998). Third tome of its stamp catalogue : Timbres de l'Europe de l'Ouest, first part, pages 774 (1955 and 1958 issues), 809 (1988), 816-817 (1992) et 822 (1995). Postage stamps of the United Kingdom Castles in the United Kingdom Stamps depicting Elizabeth II