Tang Dynasty (?) Cash Identification Help

This is a coin I bought at one point for 20 cents out of the world coin junk bin. The inscription intrigues me - I can’t seem to find a match, and it’s not a Kai Yuan Tong Bao coin, because the bottom character is not a Yuan. The coin has a blank reverse as well. It’s a bit rough, but does anyone know the inscription?

Diameter is 21.5mm.

 

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My gut said South Song, but I could not find a match.

The closest match I could find is Minh Duc Thong Bao cast in Vietnam 1527-1530.

 

Well, looks like it's not ancient or medieval at all. It's a Tu Duc Thong Bao cast in Vietnam in brass in the 19th century.

 

Yes, Hartill 103 (edited to add - Barker 103, not Hartill 103)

Copper and zinc examples exist.

 

It can’t be. The left and right characters are not the same.

 

Looks pretty similar to me.

 

Sorry, I meant Barker 103 and not Hartill. Type coin, I assume you are looking at Hartill’s Reference (25.38) and it is apparently not correct according to Barker.

 

I agree that it is Tu Duc Thong Bao.

 

#metoo^^