1 Quattrino - Anonymous Guidobaldo II, Pesaro

Guidobaldo II della Rovere ruled Urbino from 1538 until his death in 1574, and the anonymous quattrino — carrying no ruler's name — was a deliberate monetary convention for the lowest fiduciary denominations, sparing the expense of individualized dies for coins that circulated hard and vanished fast. Billon coinage at this weight was inherently a loss-leader: the metal value was negligible, and the duke's profit came from seigniorage alone.

CNI XIII places this type across a broad span, reflecting the difficulty of attributing anonymous minor coinage to specific years within the reign.