kwiatek is amazing. Please refer to my post
http://www.vikingsword.com/vb/showthread.php?t=26807
You will see more about his work.
OK here is what I know, according to Elgood and Khorasani, English had muskets and pistols factory (ies) in Iran.
But your musket looks very French to me, and the French were in India at that time. So I think it's a French musket for the Indian market. And of course they used Persian script in Northern India.