Rare Chittagong region trade coinage - tanka of Islam Shah (1545-1552), struck m

Description

Islamic legend within a square, crude "1477" in arabic numbers in the top obverse margin (the meaning is unknown) / Islamic inscriptions. Garbled partial date. Very large, 30mm in diameter, 10.6 grams. A WONDERFUL example of these. "The coins of the Indian Sultanates" D980v/B1002v. Chittagon (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.
On Oct 5, 2022 at 08:13:37 PDT, seller added the following information: