Watch List notes:

Gaius, called Caligula (37-41), As, Rome, AD 39-40; AE (g 11,08; mm 28; h 6); C CAESAR DIVI AVG PRON AVG P M TR P III P P, bare head l., Rv. VESTA, Vesta seated l., holding patera and sceptre. RIC 47.
Green patina, about extremely fine.