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That link points to the manufacturer of the hones of Sticky's original question, the same website as in my link in post 7.

All of their stones are basically the same material, a phyllite chiefly...

Thanks Bruce, I was mixing things up. Eidsborg is the traditional Nordic hone place. No idea though whether these Norwegian hones were marketed as Schwedensteine. Sigtuna has nothing to do with hones...

The ones with the blue droplet mark in Sticky's link are Västiläs. No answers in old threads on Kees' Swedenstein here and on B&B. It might be from Sigtuna?