I.D. Help

I have 4 coins with questions. The first 3 I don't know where they hail from. The other one is a Chinese coin I found the date on once, but, can't seem to find it again. I'll Put them in separate posts. The first one is this:

 

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Second One:

 

Third One:

 

Thailand.
One baht. Ruler: king Rama IX.

 

Chinese coin. Date?

 

South Korea.
100 won.

 

№ 3.
Saudi Arabia.
25 halala 1408 (1987).

 

№ 4.
Japan.
5 yena.

 

All your coins are Asian.. none are Chinese. It's understandable when their alphabet, letters and numerals look similar, but at the same time very different. Took me awhile to distinguish the difference. Siberian Man is correct on all ID's.

 

I don't know why I was thinking Chinese either. Although I have a couple. Thanks for the help.

 

It's funny how I knew there would be a Thai coin before I clicked on the thread. Those always get people.

 

Here is a little Thai ingenuity; this always cracks me up (30 sec.).

http://www.wimp.com/vegetablemarket/

 

That was crazy.

 

Just like the fish market -- sell 'em or smell 'em!

 

Yeah I had been going through a couple hundred coins from dozens of countries. I whittled it down to those four so I went for the "Ask the Audience for Help" option. Thanks for playing.