Please help me identify cash coins [решено]

Hi. I would like to ask for your help in identifying and confirming the authenticity (or not) of several cash coins. I have never collected such coins, so I am a complete layman. Most of the coins I have  are (probably) modern copies but a few look more authentic. Here is the first one:

diameter: 25,5mm, weight:  4,0g

I found one here , but it has a different diameter and weight.

N#22675

On uCoin I found this one:

https://en.ucoin.net/coin/china_empire-1-cash-1736/?ucid=59515712

I think you have correctly identified both the listings as the same as your coin with respect to denomination, emperor, mint, and date range. I see no reason to doubt its authenticity. There is some variability of weight and diameter in older, non-machine-made coins. It is also possible to delve into minor details of coins for small variations. 

Open each picture in a new tab for more details

Thank you very much for your help :)