The First War of Indian Independence occurred in 1857. The Indian National Congress was formed in 1885.
In 1875, Edward VII, then Prince of Wales, toured India for 4 months. He took a trip down the River Ganges on one of the Maharaja's barges, and was given this inkstand as a memento. It has 19 separate pieces, which come apart. The inkstand was made in the city of Benares and is one of the best examples of Awadh artisanship. (Please see the comments from Inder Kumar Misra and Arpit Pansari.)
The exhibition is called The Royal Collection Trust: Splendours from the Subcontinent." In my delicate, subtle opinion, this editorial slant insults the country. A more accurate title might be "The Delusions of British Colonialists Still Get Publicity."