what about this one???

[avdan]

any idea?
thank you.

 

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[PBK]

Looks like a Byzantine 40 nummi or follis. Here's an example:

 

[avdan]

thank you for your respond. so it means ,it is too old.!! any idea how old?? and how much valuable is that?
thank you.

 

[PBK]

More information:

http://www.worksandwords.com/moneym/byzfols.htm

http://en.wikipedia.org/wiki/Byzantine_coinage

For prices, try searching for "Byzantine follis" or "Byzantine 40 nummi" on eBay.