Dear collector-friends,
I have another unidentified coin from probably Annam.
On Internet I have found the following information - Annam, Schjoth 24, AE cash An-Fa yuan pao, type of 1700s, 22 mm, uniface.
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.