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Obulco — modern Porcuna in the province of Jaén — was one of the most prolific minting cities in pre-Roman Hispania, producing a coinage that circulated widely across the upper Guadalquivir valley during Rome's consolidation of the peninsula following the Second Punic War. The city retained enough local autonomy under Roman administration to issue its own bronze well into the second century BC, a privilege that reflected both its agricultural wealth and its strategic position along interior trade routes.

The bilingual inscriptions found across the Obulco series — combining Latin and Iberian script — make these bronzes unusually valuable to epigraphers studying the transitional period of Romanization in Baetica.