This is an ancient coin that I have had for many years and for at least 2 years sucked in olive oil to clear all dirt built up and often brush it off with a soft spatula. It has an amazing fine to very fine details and almost all circumference is intact . I placed in an air tight capsule. 

Geographic

• Mint: Constantinople
• Region: Thrace

Obverse

• Legend: D N VALENS-P F AVG
• Type: Bust of Valens, pearl-diademed, draped and cuirassed, right
• Portrait: Valens

Reverse

• Legend: GLORIA RO-MANORVM
• Type: Emperor advancing right, dragging captive with right hand and holding labarum in left
• MintMark: -/-//CONSΔ