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Gustav Overbeck, from 1867 Overbeck, in 1873 Baron von Overbeck (4 March 1830 – 8 April 1894 in London) was a German businessman, adventurer and diplomat.
Baron de Overbeck was appointed as the Maharaja Sabah, Rajah Gaya and Sandakan in a treaty which was signed by Sultan Abdul Momin of Brunei on 29th December 1877. As in 1877, the Brunei Sultanate then still believed and maintained that the territory of North Borneo was in fact still under the control of the Brunei Sultanate. Baron de Overbeck was also appointed as Dato Bendahara and Raja Sandakan in a second treaty signed by Sultan Jamalalulazam of Sulu appointing Baron de Overbeck on 22nd January 1878. 
Dent & Co. in Hongkong, 1858.
Concession from the Sultan of Brunei (left) and Sulu (right), 1877 and 1878.
^Siehe hier (PDF; 312 kB) für die offizielle englische Übersetzung
^“…this cession is one of the greatest secured by a commercial company since the days of the famous East India Company…” (Washington Post, April 12, 1878), zitiert nach den Madeleine Vinton Dahlgren Papers (Gustav Overbecks Schwiegermutter) in der Georgetown University Library