Can this coin be counterfeit? How much is it worth?

I have a coin that looks just like the one in the pictures in the link below:

http://coins.ha.com/common/view_item.php?Sale_No=27101&Lot_No=13118&type=tueicr27101-tem092907

Could this be fake? How could I tell?
I actually have 2 of them. Could anyone help me find out the value of them of them?
Is this a dollar coin, twenty dollar coin or what?

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