Some one help me in identifying the coin - Vietnam Chinese [opgelost]

Bought this coin in Vietnam.

This coin is :
An Phap Nguyen Bao (1414-1428) - Toda# 42

Citeer: "Frenchlover"​This coin is :
​An Phap Nguyen Bao (1414-1428) - Toda# 42
​

​Thanks for the information. Is there a way to identify if this is real or fake ?

If you get a mass spectrometer , you can verify that it's a "Northern Vietnam copper". The Yunnan-Szechuan copper belt extends down into Tonkin. It has a recognizable signature of almost zero iron, but high arsenic, cadmium, antimony, and bismuth. They do not have added zinc.
Even though it's a rather old coin, the quite enormous mintage and the weak will to counterfeit these old Vietnamese coins, might suggest that your coin is authentic ; in addition, plenty of old Vietnamese coins are found along the Mekong, in water, as offerings, next to numerous sanctuaries.
Without any certainty