1 Tanka - Firuz Shah Tughluq Hadrat Dehli

(en) Similar to GG# D473, D474 & D474, except this with the name of the Caliph (see Reverse description above).
The above Billon coins were issued for many years after the death of Firuz Tughluq.

History
Sultan Firuz Shah Tughlaq (1309 – 20 September 1388) was a Muslim ruler from the Tughlaq dynasty, who reigned over the Sultanate of Delhi from 1351 to 1388 CE (AH 752-790). His father's name was Rajab (the younger brother of Ghazi Malik) who had the title Sipahsalar. His mother Naila, a Hindu woman, was a Bhati rajput from Dipalpur, which is now in the Punjab region of Pakistan.

Coinage
A majority of Firuz Tughluq's coinage was in billon and copper. In billon the main denominations are Tanka of 80 rati and 32 rati coins. There are also denominations of 48 and 24 rati, and a small, very rare type probably intended as a Jital. For most of his reign, the name of the reigning Abbasid Caliph was included on the coins (as in this one). Firuz Shah's billon and copper coins were so popular that they continued to be struck long after his death, with posthumous dates. The main mint was Dehli (Hadrat and Dar al-Mulk) and a rare billon issued at Shat-i-Sind.
[Source: Goron & Goenka]