Watch List notes:

Agrippa As with Hercules Countermark. 40-as; Agrippa As with Hercules Countermark; Died 12 BC, Rome, Struck under Caligula, As, 9.15g. Cf. BM (Tiberius)-161, Paris-77, C-3, RIC-58. Obv: M AGRIPPA L - F - COS - [III] Head l. wearing rostral crown; on neck, oval countermark containing head of Hercules r. Rx: [S - C Neptune standing l. holding dolphin and trident] Flat, except for a low round protrusion caused by the application of the countermark on the obverse. No such Hercules countermark on a first-century Roman imperial coin is recorded by BMC I, pp. 31 ff.Countermark. EF