Agrippa - Neptune AE As 37-41 A.D. Struck under Caligula, Rome mint. Obv: M AGRIPPA L F COS III legend with laureate bust left. Rev: Neptune standing left holding dolphin and trident; S - C across fields. RIC 58; BMC Tiberius 161; Sear 1812. 9.55 grams. . German art market, 1990s. Mr A.H., a North American collector living in the UK.