When there was a lack of gold and silver, Muhammad Bin Tughlaq introduced the copper coin as currency. He established a minister to watch out for counterfeiting since he knew how important token money was. This plan, however, ran into difficulties because the coins had no royal seals and simply new currency usage inscriptions. By the time the famed traveller Ibn Battuta visited the Sultanate in 1334, all copper money had been destroyed. 'Struck as a current tanka in the time of the servant expectant of Divine Mercy Muhammad Tughlaq' is in the translation of the inscription on the obverse. He who sincerely obeys the sovereign obeys the merciful one, according to the reverse, and Takhtgah is the name of the mint.