Agrippa - issued by Gaius [Caligula] (37-41 A.D.) - Copper As - 29mm, 12.00g
Obverse - M AGRIPPA L F COS III Agrippa, his head left, wearing rostral crown.	Reverse - S C Neptune standing left, wearing cloak, holding trident and small dolphin.
The image below was photographed by Nemesis Ancients & Antiquities. The image above is my own scan.
Minted in Rome between 37 and 41 A.D under Gaius (Caligula). Reference: Sutherland, C.H.V., "Roman Imperial Coinage", Volume 1, revised edition (RIC), p112, nr.58 (under Caligula). Sear, D.R., "Roman Coins and their Values" (RCV Millennium Edition), Volume 1, p358, nr.1812. Sear, D.R., "Roman Coins and their Values" (RCV 4th Revised Edition), p101, nr.556  (under Agrippa). Cohen, H, "Descriptions Historique des Monnaies frappees sous l'Empire Romain" (C), Volume 1, p75, nr 3 (under Agrippa). Mattingly, H., "Coins of the Roman Empire in the British Museum", Volume 1 (BMCRE), p142-3, nr. 161-166. (Tiberius) Van Meter, D., "Handbook of Roman Imperial Coins" (VM), p74, nr. 4 (under Agrippa). Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II),  p22, nr.4 (B1, O1, R3, T1) (under Agrippa). Suarez, R., "Encyclopedia of Roman Imperial Coins II" (ERIC II-eBook),  p20, nr.4 (B1, O1, R3, T1) (under Agrippa). Kampmann, U., "Die Münzen der Römischen Kaiserzeit", 2e Auflage (Kampmann), p58, nr.11.9. (under Agrippa). Quality: Very Fine Rarity: C (Common)