There was a later run also titled "La Reina de la Costra Negra", starting in 1958 that went supposedly 45 issues, and also quite rare. I've never seen any of those.
I've seen pictures of those before. They ran a couple of articles about them in Savage Sword of Conan. How closely does it follow the mythology of Queen of the Black Coast, and of the Conan stories in general? Besides the obvious blond hair, Conan is dressed pretty closely to the way REH described him in that story.
Interested parties might want to check this out:
The first issue? Wild how the artist came up with the fur loincloth on his own, long before Frazetta.
This scene seems to be taken directly from QotBC. I'm curious if the first and last issues, like the Roy Thomas run, are adaptations of the REH story.
Roy Thomas discussed these comics in an issue of Alter Ego.