The question of spatial and temporal origins for Plumbate ware is addressed with archaeological evidence from the eastern Soconusco region of the Pacific slope, and evidence from a recent stylistic and compositional study (the latter by neutron-activation analysis). This evidence confirms the Pacific coastal-origins hypothesis proposed by Shepard (1948), suggesting specifically that the first Plumbate, designated Guayabal Plumbate, was produced in or near the littoral zone of southwest Guatemala. The development of Early Postclassic Tohil Plumbate out of Late Classic San Juan Plumbate is found not to involve a hypothesized intermediate stage (designated Robles in previous literature). The fancy abstract-incised and effigy style associated with Tohil Plumbate is argued to represent a stylistic departure of a small group of ceramic artisans who previously had worked in a long-lived background tradition.