Caligula. AD 37-41. AE quadrans 3.42 g. Rome, AD 40. 

C CAESAR DIVI AVG PRON AVG, pileus flanked by S-C.
PON M TR P IIII P P COS TERT around large R C C. 

RIC 52; BMCRE 64; CBN 109; Cohen 7.

With permission of Numismatik Lanz, auktion 72, lot 492.