Watch List notes:

Gaius Caligula. A.D. 37-41. Æ quadrans (18.6 mm, 3.09 g, 7 h). Rome mint, A.D. 39-40. C CAESAR DIVI AVG PRON AVG, pilius between S-C / PON M TR P III P P COS TER T, around R C C. RIC 45; BMCRE 63. aVF, cleaned.