Found on the N. Persian Gulf. No weight or size, I'm afraid, only these photos - but the border is distinctive. I can't find anything like it anywhere on the databases I've searched. But I can't read Arabic so I don't know what additional clues there are there.
My guess is 16th/17th century but I can get no further than that.
Any thoughts, anyone?
UPDATE: I'm getting there.
The border is the close to these ones...
Sultanate of Bengal - Nasir al din Nusrat, Husainabad mint (1518-1533) https://en.numista.com/catalogue/pieces82463.html
and this https://www.facebook.com/1001134949...zoadFGXC381s