British Guiana Kingdom, finally made formal claim to the "New River Triangle", the triangular-shaped region between the New and Kutari rivers that was in dispute. The Surinamese colonial government and, after 1975, the independent Surinamese government, maintained the Dutch position; while the British Guiana Government, and later the independent Guyanese government, maintained the British position. British Guiana is famous among philatelists for its early postage stamps, which were first issued in 1850. These stamps include some of the rarest, most expensive stamps in the world, such as the unique British Guiana 1c magenta from 1856, which was sold in 2014 for US$9.5
British Guiana United Kingdom on 26 May 1966. The English made at least two unsuccessful attempts in the 17th century to colonise the lands that would later be known as British Guiana, at which time the Dutch had established two colonies in the area: Essequibo, administered by the Dutch West India Company, and Berbice, administered by the Berbice Association. The Dutch West India Company founded a third colony, Demerara, in the mid-18th century. During the French Revolutionary Wars of the late 18th century, when the Netherlands were occupied by the French, and Great Britain and France were at war, Britain took over