No, that tag is not about some voodoo rival to Baron Samedi. Its about the evolution of a brand name. The outfit that started out as Baron Brewing Company, a production brewery in South Seattle, with a decidedly teutonic theme, subsequently opened a pub up on Greenwood Ave., in the same block as Naked City. They called this spot Pillagers Pub, and started working up a pirate theme.
Unlike Skagit River in Mt, Vernon and Iron Horse in Ellensburg, who just put the skull and crossbones on their knock-you-back IPAs, Baron Three Skulls puts the cheery symbol on all the ales they make under the Three Skulls name. They tell me the baron will be retired one day soon, pensioned off to some Bavarian village, no doubt, and the only brand made here will be branded Three Skulls. At the Winter BeerFest, they were the only brewer with a slash in their name>Baron/Three Skulls.