Help identifying arab(?) coin

Hi everyone

I just found this coin:

FRONT http://i.imgur.com/4WjeM.jpg
BACK http://i.imgur.com/a4AFj.jpg

It looks like it's from some arab country, considering the characters written in it.

I appreciate any help you can give. I'd love to know where this thing came from.

 

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It's a 20 Dinars from Algeria.

 

Indeed. THANK YOU!