Welcome aboard, I can't help with the coin, I'm thinking maybe stainless can help.............

The coin pictured in your link appears as though it might be gold, the weight listed is very close to the weight of yours. They have described the coin as:
Sultani (3.42g), minted in Egypt 1027 AH / 1618 AD in during the reign of the Ottoman sultan Osman II (1027-1031 AH / 1618-1622 AD.

What other information are you seeking?