Delhi Sultanate, Mahmud-Bin-Muhammad Tughluq, AH 752, Gold Tanka, Obv: yamin amir-ul-momineen ghayath-ud-dunya wal deen abul muzaffar, Rev: mahmud shah bin muhammad shah bin tughluq shah al sultan, 11.05g, 19.82mm, (G&G # D455), about very fine, Scarce.
Goron and Goenka in their book mentioned that at the death of Muhammad bin Tughluq, Firuz Tughluq was accepted as the next ruler by the army in Sind. In Delhi, Khwaja-i-Jahan was unaware of this and was raised to the throne a would-be son of the later sultan, with the name Mahmud. When Firuz returned to Delhi, Mahmud was set aside.
An important thing to note is that this is the only single type of Gold coin of this ruler.