Help needed to identify a Chinese cash coin

Can someone help identify this coin?  The coin is large, 40mm in diameter, 3mm thick, and weighs about 17.7 grams.  A link to the Numista catalog entry would be greatly appreciated.

 Pictures cropped. 

Similar: N#320306 

Though different size. 

Thanks for the link.  The inscription looks the same.  What is the significance of the fact that mine is a different size?  Is it a fake?

Hello

Your coin is  this one

N#320317

Quite rare coin…

Could you make better pictures

 How do you get it could help to know for fake or not

Not sure that is genuine

Didn't manage to find pictures on the net

Drawing from Cast chinese coins David Hartill

Sorry for the delay.  I bought the coin on an auction site and I just received it.  I'm posting photos. 

Thanks for your link, but that coin is supposed to be 46mm in diameter and 26.21g in weight.

The coin I received is 40mm in diameter and around 16g in weight.  It seems like it should be a different coin from the one in the link, or perhaps it's a counterfeit.  How could I tell?  Any advice?  I'd like to know if it is a fake soon, because if it is, I could ask for a refund.

Thanks for your help.

Doubt authenticity. Large value cash coins of this era ate faked often. Cast coins are incredibly easy to fake

Hello 

The link I have sent is the good one 

Your coin have the dimension and weight of a 5 cash but it's a 10 

Agree with kennyG…

What kind of action site ?

Is it a reputable action house or something like ebay?