Need help identifying Byzantine coins!

I recognized these as Byzantine coins but I couldn't get any further details.
Can anyone please help me get more information about them? Estimate value if possible?
Would greatly appreciate it  

Hi
 Is  Byzantine Solidus,Constans II. und sein Sohn Constantinus IV. 654-659.  n. Chr. GOLD. Vorzüglich, see more www.ma-shops.com/antike/maCategory.php5?selectSuCat=11&sortby=letzteaenderung&desc=desc&lang=en&pricemin=50&branche=-1&catName=Byzantine+empire.
Best Regards
Stergios