Watch List notes:

ROMAN EMPIRE: Caligula, 37-41 AD, AE quadrans (2.94g), Rome, RIC-52; BMC-64, struck 40-41 AD, pileus between S C, C CAESAR DIVI AVG PRON AVG // R. CC in center, PON M TR P IIII P P COS TERT, VF.

Estimate: 50-75 USD