Bronze as, 28mm, 11.68gm, issued AD 37-41. Rome mint.
Obv: M AGRIPPA L F COS III, Head facing left wearing rostral crown.
Rev: Neptune standing to left, holding dolphin and trident, SC across.
Issued by his grandson Caligula - the rostral crown and Neptune refer to Agrippa's victory at the sea battle of Actium in 31 BC.