Watch List notes:

A COLLECTION FORMED BY PAUL STEVENS, SULTANATES Firuz Shah Tughluq (AH 752-790 / 1351-1388 AD), Gold Tanka, no mint, undated, citing al-Hakim II, 10.85g (G&G D460). Fine, rare.
During his reign, Firuz Shah cited three caliphs on his coinage, al-Mu'tasid, al-Mutawakkil and al-Hakim II, but this is the only type that cites al-Hakim II.

Estimate: £600-800