Augustus. AR denarius, 27 BC-14 AD. 3.5 g. Spanish mint, ca 17 BC. 

CAESAR AVGVSTVS, bare head left in oak wreath.
DIVVS IVLIVS across fields, comet with eight rays and tail. 

RIC 37b, RSC 97, BMC 326; RSC 98. 

With permission of Numismatica Ars Classica, Auction 106, Lot 550, May 2018.