Watch List notes:

Sultans of Bengal, Sikandar b. Ilyas (758-792h), silver Tanka, Chawalistan 'urf 'Arsah Kamru 76xh, 10.80g (GG B180 [same dies as plate coin]). Test-mark in centre of reverse, otherwise about extremely fine, very rare.
ex J. Deyell Collection, Singapore Coin Auction 28, 4 March 1999, lot 756

Estimate: £200-250