Delhi Sultanate, Tughluq Dynasty, Muhammad bin Tughluq (AH 725-752, 1325-1351 AD), Dar-ul-Islam Mint, Silver Tanka, Obv: Arabic legend The Kalima Shahada within a circle, mint name "Dar-ul-Islam" & Hijri year off flan in the margin, Rev: Arabic legend "al mujahid fi sabeel lillah Muhammad bin Tughlaq" & the four caliphs' names in anti-clockwise in the margin, 11.20g, 27.00mm, (G&G # D360), no test mark, about extremely fine, Very Scarce.