Size and weight?
Your coin is definitely Islamic, I believe it to be a fractional (1/5) dirhem from Sindh in Pakistan, ca. 700 AD. Should be about 9-10mm and less than a gram if so. They are also common; whenever I win a coin from my usual Indian
ebay sellers, I go in and put a bunch of $1.26 bids on any they have that are nice... and usually win a couple of them.