Watch List notes:

Gaius, called Caligula (37-41), Quadrans, Rome, AD 40-41; AE (g 3,30; mm 18; h 6); C CAESAR DIVI AVG PRON AVG, round pileus between S - C, Rv. PON M TR P IIII P P COS TERT, round R C C. RIC 52; C 7.
Green patina, good very fine.