Yep. Kai Yuan Tong Bao coins were issued during the Tang Dynasty from 621 to 907 AD. Being issued for such a long time, they're fairly common and cheap, despite being so old.
An expert in the series can give an approximate date of roughly when in that time period the coin would have been struck. I'm nowhere near expert enough to do that.
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