Delhi Sultanate, Tughluq Dynasty, Muhammad bin Tughluq (AH 725-752/1325-1351 AD), Dar-ul-Islam Mint, Gold Tanka, AH 727, Obv: Arabic legends, The Kalima Shahada within an inner circle, mint name & Hijri year completely visible, Rev: Arabic legends “al mujahid fi sabilillah, Muhammad bin Tughluq Shah” & the four Caliphs' names (Abu Bakar, Umar, Uthman & Ali) arranged anti-clockwise, 11.1g, 21.5mm, (G&G # D341), sharp legends, no test marks, almost uncirculated, Extremely Rare in this condition.

Note: Initially, when the currency of the Delhi Sultanate consisted mostly of the billon Dehliwals, coins appear to have been struck from the mints of the former Hindu rulers of Delhi, Lahore, Budaun and possibly elsewhere. These issues can be distinguished on stylistic grounds. Thereafter, most of the coins of the Sultanate were struck at Dehli or at one of the new minds built by different rulers from the Dehli area (eg..Dar-al-Islam, Tughluqabad, etc.). The identification of Dar-al-Islam is far from certain. This mint name occurs first on the coins of Ala ud-din Muhammad Khilji. This ruler built a new Dehli at Siri, some distance to the north of the then-existing city. One theory is that when Muhammad moved to the new city in AD 1303, he began striking coins with the mint-name Dehli from there, while the coins with the mint-name Dar-al-Islam were struck from the old city college. There is, however, no historical evidence to support this theory. Another possibility is that these coins were struck at Ranthambhor, which was captured in AH 700 and thenceforth called Dar-al-Islam.