1979 american coin with large heraldic eagle at back?

how much does it cost? it is pretty heavy. silver i think. large coin. bust silver dollar if i am correct. it looks real enough. as large as a pog toy

2011-12-17T21:32:35Z

http://coinauctionshelp.com/Draped_Bust_Half_Dollar.html

curtisports22011-12-17T11:53:48Z

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I need to see both sides. It sounds like a private-mint medal. Medals are not coins.