Experts Puzzled by "UFO" Coin

A 17th century French coin seems to depict a "flying saucer over a countryside," but what was intended to be portrayed remains a mystery.

The jeton, an educational aid to help count money, is inscibed with the words Opportunus Adest which translates as "It is here at an opportune time," adding to the mystery. The coin is thought to perhaps depict Ezekiel's wheel.