Green patina.
Roman Imperial
Marcus Agrippa (27 BC-14 AD, grandfather of Caligula), posthumous issue under Caligula (37-41), As 37-41, Rome mint
Obverse: head left wearing rostral crown
M AGRRIPPA L F COS III
Reverse: naked Neptune standing, holding a small dolphin and trident, on the sides of the letters SC
Diameter 30 mm, weight 11.52 g
