The middle bit looks like it might be "OF", isn't some Orrefors marked OF? Maybe the first bit is initials of the designer, maybe "WJ"? Any designers with those initials or similar? I'm not that well up on Orrefors. Orrefors does own Sea Glasbruk though, so that could explain the similarity...
Edit - I did think Flygsfors at first too, but I've never seen any Coquille that wasn't marked Coquille (might just be me though)...and the pontil mark doesn't seem right for Flygsfors from what I know.