It was the center one which gave me the clue as to what this selection could be. It is more than likely a Ægirshjálmr, the Helm of Awe or Helm of Terror in Seidr, Old Norse magic, and probably Icelandic. If so, it was a part of the magic called sjónhverfing, which was used to affect the mind with forgetfulness, delusion, illusion, fear, delusion or deceiving of the sight. It looks similar to this:
[I wanted to edit this and add more, but I kept getting an Internal Server Error from the edit page...]
What I wanted to say is that if these are not what I suggest, then I have no clue as to what they are.
They could be merely designs by local artists.
I notice that you are from Bankok, were you traveling?
Where and who did you get them from?
What metal are they made of?
They are from Rudolf Koch's The Book of Signs, Dover Publications. He was a graphic designer and took tradtional iamges and redrew them in an attractive modern format.
Ah! Thank you, Adam.
I knew they looked familiar, but couldn't remember the source. I used to have Koch's book until I lent it to a friend (...who is no longer a friend!). I remember that his illustrations were good, but the corresponding text was sorely limited.