Watch List notes:

Octavian, autumn 32-summer 31 BC. Denarius (Silver, 21 mm, 3.91 g, 6 h), uncertain Italian mint, possibly Rome. Bare head of Octavian to right. Rev. CAESAR DIVI F Pax, draped, standing facing, her head turned to left, holding an olive branch in her right hand and a cornucopia in her left. BMC 605. BN 26. Cohen 69. CRI 399. RIC 252. A lovely, toned example, struck on a broad flan. About extremely fine.
From an old European collection.

This coin is from an issue, which is characterized by often being struck on flans that are larger than the dies used to mint them; this gives the coins a rather dramatic look, as it does here.