Korean Song Pyong Tong Bo Coins that confuse me

Hello everyone, first I'd like to say I hate forums and usually stay away from them like the plague, but from reading a few ya'll seem like a nice bunch. Anyway I'm in South Korea o/ yay, and my buddy is really into metal detecting. So he showed me a few coins he found which he knows nothing about, so I did some research. I know that they are Song Pyong Tong Bo coins and that there were bigillions of variations on them in the 1600's-1800's.

Well I'll just show you them, first is from my research a 5 mun seed coin, the odd thing about it is that it is identical on both sides, I apologize but I only took a picture of one side, if you like I will get the other side also. (Big one in the middle) This one in its self isn't that weird to me but thought I'd ask for input, and yes he cleaned this one.



The second one is the one I find completely off the wall, I dunno maybe I'm just an idiot but the front face says the usual Song Pyong Tong Bo and the back has very odd symbols, I honestly don't know what to make of them. I thought maybe its a charm of some kind but really I have no clue, since I can't find any kind of charm even remotely similar. Again I apologize for only taking a picture of one side, I now realize that may have been a bit stupid but I can supply of opposite sides of both if needed/wanted.



Thank you so much for your knowledge and advice, I hope to start joining him on his metal detecting adventures, though my wife would kill me if I actually bought one  

First one's a Korean charm, second is a Boo-jiyan coin, either from Qianlong or Jiaqing era

Thank you! The info on the second one was all I needed to learn about it and now I even found a picture of it online. Not to mention I learned about the almost lost Manchu language. It was minted between 1736-1795, though it's not really worth anything from what I saw... still fascinating!

What makes you think the first one is a charm and not some variation of the Song Pyong Tong Bo korean coin?

The surface between the characters is similar to copies of cash and usually charms. It's a very large picture, I'll look at it tomorrow