Gallienus, 253 - 268 AD
Silvered Antoninianus, Rome Mint, 21mm, 3.10 grams
Obverse: GALLIENVS AVG, Radiate and cuirassed bust of Gallienus right with slight drapery on far shoulder.
Reverse: MARTI PACIFERO, Mars standing left holding branch, spear and grounded shield.
RIC 236, MIR 569w, Rare
Appears to be fully silvered under a light coat of soil, nice UNC example.