Tetrobol

Ainos, a Thracian coastal city at the mouth of the Hebros River, maintained its own robust silver coinage well into the fourth century despite sitting uncomfortably between expanding Macedonian and Odrysian Thracian power. These tetrobols belong to a narrow four-year window identified by J.M.F. May's exhaustive 1950 die study, which remains the definitive reference — May's sequencing of the Ainos series by die linkage was meticulous enough that individual emissions can be dated with unusual precision for a Greek civic issue.

SNG Copenhagen 412 provides the closest parallel for fabric and style.