Unknown China Cash [opgelost]

Some years ago I bought 3 coins of the same type in Beijing. I think they are not fake but not so sure. Anyone can identify these cashes and tell me if they are real? Thank you
The weight is little more than 3 grams and the diameter is about 23 mm. Metal is unknown to me but I think some kind of brass.
Thank you

Hello,

We need the pics of the other side to tell you exactly what they are. Bottom left is a Kai Yuan Tong Bao but it doesn't seem real to me. It looks like brass, but should be bronze. The style seems quite off to me. Bottom right is suspicious and top looks ok, but I need the other side to be sure.

The bottom 2 do look strange

Citeer: "Choucas"​Hello,
​
​We need the pics of the other side to tell you exactly what they are. Bottom left is a Kai Yuan Tong Bao but it doesn't seem real to me. It looks like brass, but should be bronze. The style seems quite off to me. Bottom right is suspicious and top looks ok, but I need the other side to be sure.

​The 3 ones are identical. I posted a picture of one head and the other back plus the third that's in bad conditions.
Thank you

In any case here to you and thanks again

Hello,

Thanks for the pics. The two first are indeed identical and are a modern fantasy. They feature Kai Yuan obverse (Tang dynasty) with a qing mintmark.
The last one, however, is different and genuine. It's a Kangxi cash. If i see right, the mintmark is Dong :
https://fr.numista.com/catalogue/pieces22767.html

Thanks a lot. Very kind