Very crude Legends on both sides: Bahadur Shah Sultan ibn Mahmud Shah Sultan Khallada Allah Mulkahu Wa Sultanahu / Shahada and al-sultan bin al-Sultan, four Caliphs in margins. 24.5mm in diameter, 10.10 grams. "The coins of the Indian Sultanates" B1009.
Extremely rare type, rated RRR (highest rarity ranking) in Goron/Goenka.
Chittagong (an area in Eastern Bengal) issued Bengal-type coins whenever it would come under the influence of Bengal. The coins issued in Chittagong are characteristically crude, full of spelling errors and retrograde letters (like on this coin) and struck to a tanka standard (10.3-10.7 grams), not to a rupee standard used by Islam Shah (11.4 grams). All Chittagong coins are rare to very rare, and are very difficult to find.(F272-w31389)