What is this one troy once .999 fine silver coin with no date worth?

I found a coin that is one troy ounce .999 fine silver. The other side has a flying eagle with the liberty bell behind it. The edge has stars around it (12 of them) but the coin has NO DATE on it. Where could I search for how much its worth? Or does anyone know?

http://shop.ebay.com/items/_W0QQ_nkwZ1Q20ozQ20silverQQ_armrsZ1QQ_fromZR40QQ_mdoZ

Looks like it is worth about $15.00 retail. If you try to sell to a dealer they will give you less.

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