Dear collector-friends,
I am very happy to join this community. My happiness is clouded with fact that I lost the text I wanted to share with you because of image loading. Beginners fault but very, very annoying.
I would like to ask you for help with coin identification.
I have a coins and I found its picture on Internet with short explanation. N185A Annam AE cash 18th Century AD.
I need to know more about this coin.

Is it really a coin from Annam?
During which years was it strike?
Who was the ruler or lord who has ordered to strike this coin?
This coin was valid in all Annam, or only a part of it?
Thank you very much.