Augustus. AR denarius, 17 BC, Rome. 3.63 g. 

AVGVSTVS DIVI F, bare head of Augustus right. 
M SANQVINIVS III VIR, laureate head of the deified
Julius Caesar right, comet above. 

RIC 338. C. 1. BMC 71. CBN 278.

With permission of Helios Auction 5, June 2010, lot 208