Reference
OpenAI's Answer
The arms of the Orange Free State were in use from the establishment of the republic in 1854. Initially, when the Republic of Orange Free State came into being on February 23, 1854, it had neither a coat of arms nor a flag. By May 15, 1854, these symbols were established. The arms of the Orange Free State continued in use until the end of the Anglo-Boer War, after which the region was annexed by the British and became the Orange River Colony in 1902. This resulted in the previous symbols of the Orange Free State becoming obsolete as the colony adopted different heraldic symbols.
Thus, the arms of the Orange Free State were effectively in use for about 48 years (from 1854 to 1902) before they were superseded by the new symbols of the colony under British rule.
For more detailed historical information, you can visit the article on CRW Flags: Orange Free State.
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