Please help ID small part of some kind of collection (asian?)

Hi,

I have been given a couple hundreds old coins.

I was able to id most of them but I'm in trouble with these, can you help me?

Thanks in advance.

 

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After some more searching it seems that most of these are 'common' old chinese coins (are they?), the big one is from Japan.. what about the one in the bottom right part of the image?

Thanks.