Inscriptions on both sides: Husein shah bin mahmud shah bin ibrahim shah sultani / khalifa abu'l fath, date below (868 AH = 1463 AD). 15.5mm, 4.66 grams. Dated to 868 AH =1463 AD. White colour, decent quality billon, better than the scan. "The Coins of the Indian Sultanates" J30; Rajgor 2732.

These coins are listed as "copper falus" in Goron/Goenka, but hoards of unquestionably billion and/or silvered coins keep being unearthed, and it seems that at least initially these coins were intended as a 40-ratti standard half of a billion tanka. 

The City of Jaunpur was founded by Firuz Tughluq in the memory of Muhammad Tughluq who was also known as Juna Khan. Khwaja Jahan (Malik Sarvar), overseer of the area for the Delhi Sultans, declared himself independent in the confusion caused by Timur's invasion. He was succeeded by his adopted son who took the title of Mubarak Shah. Ibrahim Shah, the next king, was a great patron of learning. During his time, the Sharqi style architecture was developed, and the Atala Masjid was completed in 1408. The last ruler, Husain Shah, was defeated by Bahlol Lodi. At the time of Sikandar Lodi, Jaunpur was permanently annexed to the Delhi Sultanate.