China coins - identification please

I received some Chinese coins and I know nothing about them. I want to know what kind of coins are, what time and if worth anything. I hope you can understand something from the pictures, because some pieces are corroded.
Thank you!

nr 3: 1 cash, northern song dyn. av: zhi ping tong bao (li script), ruler: yingzong

nr 4: japan 1 mon

nr 5: av: qian long tong bao rv: ? unreadable

nr 7: 1 cash, av: qian long tong bao rv: boo je

nr 8: av: jia qing tong bao rv: ? unreadable

nr 9: 1 cash, av: qian long tong bao rv: boo chiowan

nr 10: av: dao guang tong bao rv: looks like boo yun, or maybe boo yuwan unreadable

continue unfinished part....

nr 1: both side unreadable

nr 2: ob: (upside down) qian long tong bao, rv: unreadable

nr 6: ob: (upside down) qian long tong bao, rv: unreadable

Hello!

Just found a Chinese Coin and would want to identify. I don't even know if it's a coin or a simple token, as I can't find it listed anywhere.

Thanks for the help!

amulet

It is a eight trigram charm:
(trigram: symbol with 3 lines)
http://primaltrek.com/bagua.html
But I can not read what is written on it.
Therere are so many different chinese charms that it is nt easy to find the correct one if you do not read the chinese

Thanks PetrusAscanus and bbybugs for the quick replies. I'll keep it, as no amulet can be a harm, can they?

Citeer: CeballosThanks PetrusAscanus and bbybugs for the quick replies. I'll keep it, as no amulet can be a harm, can they?

You are welcome!

Yes, no harm, I'll keep it if I have.  

FYI:
Chinese text : 乾坤 is heaven and earth, universe
and probably the name of 2 Buddhist or Taoist monks