Reviewing the following Royal Mint correspondence we learn that an act was passed on
December 8, 1864 to request a bronze coinage with a nominal value of £2,000.
There were to be equal number of the thirteenth part of a shilling coins and the twenty sixth part of a shilling coins minted.
December 08, 1864 -- The official act requesting for coinage
Note the money is to be "as the copper money lately coined in England" but in 1/13ths and 1/26ths.