Gold aureus, 19mm, 7.21gm, issued AD 72/73 Rome mint.
Obv: IMP CAES VESP AVG PM COS IIII, Laureate head right.
Rev: NEP RED, Neptune standing left, right foot on globe, holding acrostolium and sceptre.
References: RIC 358, BMCRE 68.
This coin fits the following collection focus(es): Twelve Caesars.