Naval Ensign of South Africa (1959–1981)

This naval ensign contains the 1928 – 1994 flag of South Africa, which contains the flags of the UK, the Orange Free State, and the South African Republic. The flag of the Orange Free State has the flag of the Netherlands in the canton, i.e. the flag in a flag in a flag in a flag. (https://www.reddit.com/r/vexillology/comments/oluib9)