They've taken some time to track down, but the 2016 "I" mintmark sovereigns are here. These were minted in Delhi on behalf of the Royal Mint, London. They are from the first series of sovereigns minted outside of the United Kingdom since 1932, and have proven to be very popular - and very difficult to get, too.
They are available in the original red card. In a few weeks, PCGS-graded examples will be available too.
For inquiries, please email.