Sent for ID: Mark Replied:
Cool! Рand just about too easy. This is a fourr̩e of the Augustus Gaius & Lucius denarius. One of the most abundant of early Imperial denarii РThis is a photo of a whole official piece:

Caius and Lucius Denarius

This is a none-too attractive specimen I used to own, but it should be complete enough to give you a feeling for the overall design and the early counter-clockwise orientation of the legends on these.

Mark