Rare round silver rupee. Inscriptions on both sides: Al-imam al-azam khalifa rabb al-alamin qutb al-dunya wa'l din abu'l muzzafar bubarakshah  al-sultan ibn al-sultan al-wathiq billah amir al-muminin, date and mint in margins (mostly off-flan). Qila Qutbabad mint. Large and thick, 27mm wide, 10.8 grams. "The coins of the Indian Sultanates" #D260, Rajgor 1035, NW 374A.

Rare! Actually scarcer and harder to find than the rare square tankas of the same Sultan.