New Delhi Sovereigns 2013-2015
During the era of circulating gold coins, sovereigns were struck in India in one year - 1918. In 2013 the Royal Mint partnered with MMTC PAMP to produce non-circulating bullion sovereigns, primarily for the Indian market. The reverse of the sovereigns showed St George slaying the dragon as on traditional sovereigns, and like the 1918 Bombay-struck sovereigns, they bore an I mintmark above the date. From 2013-2015 they were struck with the Ian Rank-Broadley portrait of Queen Elizabeth II. Although they are commonly referred to as New Delhi sovereigns, they were not actually struck in New Delhi.
The 2013 sovereign was meant to have an initial mintage of just 50,000 but clearly proved to be a popular issue as nearly 45,000 more were struck (https://sites.google.com/view/thepettyhoard/the-indian-sovereigns).
The 2015I sovereigns were the last Indian sovereigns to be struck with the Ian Rank-Broadley portrait of Queen Elizabeth II - from 2016 onwards they were struck using the new Jody Clark obverse portrait.