Delhi Sultanate, Nasir ud Din Mahmud (AH 644-664/ AD 1246-1266), Hadrat Delhi Mint, Silver Tanka, Obv: ruler's titles within double square in circle; annulets in segments, ibn or bin in fourth line, Rev: fi 'ahd legends: caliph al- must' asim, within double square in circle; annulets in segments, 10.77g, 26.00mm, (G&G # D137) about very fine.