| 25 October 1883 |
|
Telegraphic Convention between the Cape of Good Hope, Natal and the Orange Free State |
| 28 March 1889 |
1 July 1889 |
Convention between the Colony of the Cape of Good Hope and the Orange Free State for the establishment of a customs union |
| 24 April 1889 |
24 April 1889 |
Protocol between the Colony of the Cape of Good Hope and the Orange Free State respecting the Customs Union Convention of 28 March / 5 April 1889. |
| 20 June 1890 |
6 April 1891 |
Convention Between Great Britain and the Orange Free State , for the Mutual Extradition of Fugitive Criminals |