Two large complexes of struck lead pieces, from the Roman colony of Minturnae nd from Baetica (southern Spain) in the late Republic, have been documented in recent years. There are close and unique iconographic parallels between them. We accordingly undertook an analysis of the isotopic signatures of the leads used in the two areas, to see if this aids in understanding their relationship. A t the same time, we investigated the presence of tin in the alloys of both complexes, and its implications. We then expanded to a consideration of the evidence of the presence in Carthago Nova of Italian gentes known from the area of Minturnae in the second and first centuries, and their role in the production of, and trade in, Spanish lead. This allowed us to identify a die-linked series among the lead pieces from Minturnae, signed by members of some of the most prominent gentes at Carthago Nova, which we suggest is evidence of a company trading between the two ports. We also investigated possible contacts with Minturnae of the gentes signing the Baetican complex.