R6 1763 Proof Set (believe there may only be 2 sets in existance ,one held by the British Museum and one in a private collection . Source : Steve Fass)
**** More information : 1831 - Obverse by William Wyon.Reverse by J B Merlen.Plain edge.Extremely rare .Sets are mainly in museums eg Hunterian.Coins often sold as single coins.They were struck in near pure gold for presentation to the wealthy and Indian Maharajahs.