Chinese coins identification!

I have a few coins that I need help to identify please :o
















Thank ya'll!!

First one is Japanese 1 yen. Showa 31st year - 1956.

Thank you! I already added it to my list now 1 one down and a few more to go  

Dude these coins are pretty rare man!

2. ROC 2 Jiao Year 15
3. Tibetian coin (made in Sichuan)
4. ROC 1/2 Yuan Year 31
5. China - Empire 5 Cash

The 5 Cash coin is ridiculously rare. Where did you get it?

I'm not sure about the Tibetan coin, so you might want to check the diameter.

Well some I get from mercadolibre.com which is a Latin American version of eBay, others at the antique shops and also China town    Thank you for all the helpful information, and if you are interested I can trade one or two of these coins for another reasonable one!

The two Chinese ones (#2 & #3 pictures, #4 & #5 pictures ) I would check to see if they stick to a magnet (which means they are fake). I have seen many of these that are magnetic, which is not a total loss, for there are many collectors for such coins as well.

Picture #6 & #7 is a 50 Cent (or 1/2 Yuan) coins from China, dated 1942.

Picture #8 & #9 are for an Chinese empire, probably 20 Cash coin (KM Y#5) or possible Y#5.1; dated 1903 - probably real.

Hope this helps

Thank you Jadish for letting me know about this! Though I consider my self lucky sense the magnetic test failed

These are undoubtedly real.

Fake silver coins would be slightly offstruck and have wear around the rim. These are evenly worn.