Octavian. 30-29 BC. AR Denarius (3.56 g. Uncertain Italian mint, possibly Rome. 

IMP, helmeted head of Mars right.
Round shield with central star inscribed CAESAR. 

RIC I 274; Sear, CRI 428; BMCRE 644 and note *; BN 90; RSC 44. 

Triton V Sale, 16 Jan 2002, lot 1856.
By permission of CNG, www.cngcoins.com.