Hello everyone!
I noticed something odd about one of the coins I found from circulation, and I wanted some help if anyone knew what exactly was going on. You may not know exactly about Pakistani 2 Rupee 2006 coins, but maybe by looking you can figure out what it is.
As far as I'm aware, there is no 2006 "proof" coin, and I've personally never SEEN a proof coin, so I wouldn't know what it looks like.
I don't THINK it is a counterfeit either, because, honestly, counterfeiting a circulation coin that can barely get you a piece of gum doesn't make sense.
Maybe it was dipped in some acid or something, but again, that doesn't make sense to me...why would anyone do that?
So I figured maybe this is some sort of variety or error or something? That is where I was hoping you'd all be able to help.
Here is the coin. I've put a "normal", usual coin on the right for comparison. The one I am talking about is the left one:


The Pakistan 2 Rupee 2006 coin is Nickel-brass, and 22.5mm and 5g. I have no way to measure the weight of something so small, but the diametre is the correct.
So...help?
