A third century BC inscription of “immunity” is exhibited in the Archaeological Museum of Mytilene. The immunity was granted by the people of the Aetolians to the Municipality of Mytilene. Till recently Patton’s interpretation of the relief decorating the inscription as depicting a ship was generally accepted. However, a more careful examination of the relief has led us to the conclusion that what is represented here is the lower jaw of a wild boar, and more precisely the jaw of the Calydonian boar, which is also depicted on Aetolian coins.