Gustav Overbeck, from 1867 Gustav von Overbeck, from 1873 Freiherr von Overbeck, from 1877 Maharaja of Sabah and Rajah of Gaya and Sandakan, was a German businessman, adventurer and diplomat.
Dent & Co. in British Hong Kong, 1858.
The first concession treaty was signed by Sultan Abdul Momin of Brunei on 29 December 1877
The second concession treaty was signed by Sultan Jamal ul-Azam of Sulu on 22 January 1878
Abdul Momin ibni Abdul Wahab was the 24th Sultan of Brunei from 1852 until his death in 1885. Abdul Momin sought British support as he blocked Charles Brooke's attempts to acquire more Bruneian land i
Illustration of Abdul Momin
1926 Admiralty chart of Baram River (bottom left) and Brunei