Following the First war of Independence in 1857, the British government took direct control of British India. Since 1851, gold sovereigns were produced en masse at the Royal Mint in Sydney, New South Wales. In an 1864 attempt to make the British gold sovereign the "imperial coin", the treasuries in Bombay and Calcutta were instructed to receive gold sovereigns; however, these gold sovereigns never left the vaults. As the British government gave up hope of replacing the rupee in India with the pound sterling, it realised for the same reason it could not replace the silver dollar in the Straits Settlements with the Indian rupee (as the British East India Company had desired). Since the silver crisis of 1873, a number of nations adopted the gold standard; however, India remained on the silver standard until it was replaced by a basket of commodities and currencies in the late 20th century.