Watch List notes:

A COLLECTION FORMED BY PAUL STEVENS, SULTANATES Qutb al-Din Mubarak (AH 716-720 / 1316-1320 AD), Gold Tanka, Hadrat Dar al-Khalifa(?), AH 718(?), rev legend in square border, 10.79g (G&G D246A, this coin). Very fine and extremely rare, possibly the only specimen known. The only round coin of this ruler with the reverse legend in a square border.

Estimate: £1000-1200