The reverse of this Sestertius under Hadrian has Aequitas standing and holding scales. Wildwinds shows only one example of this series reading COS III on reverse. RIC 637. My coin reads COS I Delta II. It weighs 25.21 g. Please post any comment.
The dips around the letters scare me. I have never seen a Hadrian with COS I (in his day they would not have written the I) or a delta (for DESIG). Tooled? Barbarous? Search for similar things or hope for a reply from a Hadrian specialist.