It's a Kai Yuan Tong Bao, issued by the Tang dynasty emperors between 621 and 950 AD. An expert in cash coins might be able to give you a narrower date range for your coin.
Edit: typo in Dynasty name. Sorry!
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
The patina looks odd and the calligraphy is little off from the examples in Hartill. It may be real, but it doesn't look right to me. Compare it to the examples at Zeno.ru http://www.zeno.ru/showgallery.php?cat=3480
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