The dates given don't agree with the other coin attributed to Giyath al-din Bahadur.
Also, he was not a Bengal Sultan but was ruler of the House of Balban 1322–1324, which lost power to the Delhi Sultanate. He was then appointed Governor of Bengal under Tughluq dynasty 1324–1328 and then declared independence. It's complicated but the Bengal Sultan era doesn't begin until 1338. see https://en.wikipedia.org/wiki/List_of_rulers_of_Bengal and https://en.wikipedia.org/wiki/Ghiyasuddin_Bahadur_Shah
Also, it would not have been called a rupee but a tanka. The word rupiya existed in ancient times but it wasn't a standard coin denomination until Sher Shah Suri created the rupee currency system 200 years later.