Delhi Sultans, Mohd bin Tughlaq, Billon Tanka, AH 730,GG Weight : 9.23 Grams ; OBVERSE: within a multiple ornate pentagon border of arches and pelleted dots within arches: duriba fi-zaman al-'abd al-raji rahmat allah muhammad bin (tughlaq) "struck in the time of the servant hoping for the mercy of Allah Muhammad bin (Tughlaq)" REVERSE: al-sultan al- sa'id al-shahid tughlaq shah sana thalathin wa sab‘mi’a “The Sultan The Fortunate The Testifier Tughlaq Shah (struck this coin in) the year thirty and seven hundred” Note : This was one of the novel innovations of Mohd bin Tughlaq (MBT) that became the mainstay of the Delhi Sultanate coins subsequently. The Billon Tanka was introduced in AH 727 ie within the 3rd Year of MBT's reign, replacing the earlier silver tanka's in circulation.