Nero, 54-68 AD. AE28 / Dupondius (11.06g, 6h). Radiate head right; countermark: ΓAΛBA in incuse quadrate directly across face / Poppaea (as Securitas) seated right. VF, green patina. Very rare.
For coin: RG -; cf. C. Howgego, “Greek Legends and Roman Types: a Neronian Enigma,†SM 140 (November 1985), 3 and 4; RPC 2060 (including c/m); for c/m: Howgego 591