Anyone know these Asian coins?

I don't read Japanese or Chinese so I can't determine exactly what they are.
Anyone have any idea?
Hope I'm posting in the right place. It's my first post. I have more that I can't identify but will post them later.

 

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a little googling gets this on the oval coin:
coinquest japanese oval coin

A little hard to see, but the silver looks like a Japanese 10 Sen coin???

 

Thank you. Very helpful.

 

The first coin is a coin from Manchukuo. I can't quite see the date due to the low grade.

To identify it, please feel free to use this site as reference: http://issuu.com/gxseries/docs/manchukuo_year_coin_album

 

Manchukuo. Like this one.

 

Once itself also acquired a similar oval coin. It turned out that this – 100 Mon. In Ukraine this coin is about 25 USD.