Watch List notes:

Gaius Caligula. A.D. 37-41. Æ sestertius (35.9 mm, 27.66 g, 7 h). Rome mint, A.D. 39-40. Rare. C CAESAR DIVI AVG PRON AVG P M TR P III P PIETAS, Pietas, veiled, seated left, holding patera, left arm resting on small draped figure / DIVO AVG, S-C, Hexastyle temple, garlanded, surmounted by quadriga, before which Gaius, veiled and togate, sacrifices with patera over altar; one attendant leads bull to the altar, a second holds a patera. RIC 44; BMCRE p. 156. VG.