Firuz Shah Zafar, Silver Tanka, 10.90g, Delhi Mint, Arabic legend on both sides, Obv: “al Sultan al Azam Firuz Shah Zafar ibn Firuz Shah al Sultan”, Rev: “Fi Zaman al Imam Amir al Mumineen Abi Abdallah Khulidat Khilafatahu” in circle (Not listed in G&G). Unique. Extremely fine, exceedingly rare. An exceptionally rare and unique issue of Firuz Shah Zafar, one of the shortest-lived sovereigns of the Delhi Sultanate. His brief accession during the turbulent Tughluq succession crisis of AH 791 is recorded most importantly through his coinage, making these issues valuable historical documents as well as numismatic rarities.