In 1993, to celebrate the 40th Anniversary of the Queens Coronation, the Royal Mint released a Limited Issue 1 One Sertum Gold Proof Coin struck in solid solid fine .999 Gold weighing one Twenty-Fifth of an ounce of solid pure Gold.
The reverse features a representation of Buckingham Palace with a member of the Household Cavalry in the foreground while the obverse features the Bhutan Coat of Arms.
These legal tender coins have been struck to proof quality using specially prepared dies and highly polished blanks.