I took help from a person who is familiar with Arabic language.according to him the obverse mentioned that Marwan is the slave of God.Also in the thickness side the date and some Arabic recites a written. Also I am not sure is it a coin of medal or seal.From google I got Marwan was a khalipa(king) at umayyad period. The metal is very amazing- if clean again it took a dark color with in 30 min. Any idea/ information?

