Unknown Coin? Any Help Would Be Appreciated...

It is a classic Byzantine Christ on one side, and on the reverse latin letters speaking Greek words that says Jesus Christ King of Kings. The site below has every Byzantine coins of interest all in one place and you can scroll down to see it. It is an old but very respected computer server so if you get a time out error at first it just means no one is using it. The next hit goes through. I gave the most likely coin below that as the match but you can see for yourself at the site.

http://www.wildwinds.com/coins/sb/i.html

Constantine VIII, Class A3 anonymous follis, 1025-1028 AD. IC-XC to right and left of bust of Christ facing with nimbus cross behind head, 2 dots in each limb of the cross, holding book of gospels with dot in centre of the book's border / +IhSUS XRISTUS bASILEU bASILE in four lines. SB 1818.

Thank you very much for your great efforts and your valuable information. Actually I'm not quite familiar with ancient coins but more interested in newer coins. I checked the site and I also agree with SB 1818 but SB 1813 also looks very similar. How do you differentiate it? And I guess the grade of the coin is bad compared to the one on the site. So, I think you don't consider that it is a fake coin. Do you have any suggestion its approximate value in this form? Thanks.