Dynasty Qing Coins (Cash) - Help

I'm interested in these coins from the Qing Dynasty, I would like friends' opinions on their authenticity. We know that many copies are made with precision...

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Although they are common coins and those of emperors from the 1600s onwards, it would be interesting to have them in the Asian section.

 

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The first two look somewhat suspicious, the third is fine.
Here are their ID's:
1: Kangxi (1662-1722)
2: Daoguang (1821-1850)
3: Jiaqing (1796-1820)

 

Thanks a lot for the help! If in doubt, it's better not to buy