Watch List notes:

Gaius, called Caligula (37-41), Quadrans, Rome, AD 39; AE (g 3,66; mm 18; h 6); C CAESAR DIVI AVG PRON AVG, round pileus between S - C, Rv. PON M TR P III P P COS DES III, round R C C. RIC 39; C 5.
Good extremely fine.