Islamic coin, I cannot identify [opgelost]

https://en.numista.com/catalogue/bengal_presidency-1.html

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@Geison is correct. It looks like a 1 pice of Shah Alam II, Bengal Presidency, Calcutta mint. Undated but made approximately 1796-1809. There are several varieties, KM# 52-57, which can be distinguished by accurate measurement of weight and diameter. For best results it's helpful to post these with ID requests, as described in the posting guidelines. 

Please excuse the previous blank message, which I was trying to edit but accidentally duplicated, so I deleted the text there. 

Many thanks geison