Watch List notes:

The Roman Empire

Octavian as Augustus, 27 BC – 14 AD. Sestertius, Pergamum circa 25, Æ 24.06 g. AVGVSTVS Bare head r. Rev. C·A in dotted circle within laurel wreath. C 570. BMC 713. RIC 50. CBN 958. RPC 2233 (Asia). Howgego, NC 1982, p. 3, 2.
In exceptional condition for the issue. An unusual portrait struck on a very
broad flan. Olive brown-green patina and about extremely fine

Ex NAC sale 59, 2011, 874 (expertly conserved since).