37-41 AD., Gaius, contemporary imitation or uncertain provincial branch mint, imitative As, cf. RIC 58.

Gaius (called Caligula), imitative issue, contemporary imitation or uncertain provincial branch mint(?), 37-41 AD. and later,
imitative Æ As (24-25 mm / 6,01 g),
Obv.: M AGRIP[PA L F] COS III , head of Agrippa l., wearing rostral crown.
Rev.: S - C , Neptune, cloaked, standing l. holding small dolphin and trident.
cfl.: C. Kraay, Coin finds of Vindonissa nos. 3268-3466, especially nos. 3565-3466 (pl. IV ) ; for prototypes, cf. RIC (Gaius) 58 ; Coh. 3 ; BMC (Tiberius) 161 ; CBN (Gaius) 78 .

In an attempt to meet the needs of local demand, Gaius' and Claudius' aes coinage was heavily imitated throughout the provinces. Because many of the die engravers making these imitations were highly skilled artisans, style is most often the only key to distinguishing between an imitative and an imperial issue. The portrait of this imitation and it´s low weight suggest it may be an contemporary imitation struck in a provincial mint.