Quinarius - Postumus

Postumus seized control of the breakaway Gallic Empire in 260 AD after eliminating Saloninus, the young co-emperor left in charge of the Rhine frontier while Gallienus was occupied elsewhere. The gold quinarius — half the weight of an aureus — was a denomination with deep Republican associations, rarely struck under the Principate and almost never revived by imperial mints. Postumus minting it signals a deliberate appeal to Roman traditionalism, a calculated legitimacy move by a general ruling a state the Senate never recognized.

Surviving examples are genuinely scarce. The specific die pairing documented under Elmer 3 and AGK 3a confirms this was an early emission of his reign.