Watch List notes:

Gaius (Caligula). AD 37-41. Æ Quadrans (17mm, 3.24 g, 6h). Rome mint. Struck 1 January–18 March AD 40. Pileus between S C / PON M TR P III P P COS TERT around R C C. RIC I 45. Dark green patina, light roughness. VF.