Delhi Sultanate, Turk Dynasty, Ala ud-din Ma'sud (AH 639-644/1242-1246 AD), Hadrat Delhi Mint (off flan), Silver Tanka, Obv: Arabic legend "al-sultan al-a'zam "Ala ud dunya wa'l din Abu'l Muzaffar Mas'ud Shah ibn al-sultan", Rev: Arabic legend " fi "ahd al imam al mu'stansir amir al mominin", 10.9g, 26.00mm, (G&G # D120), about extremely fine, Rare.