Whilst routing through my boxes of glass, I've come across this unidentified one, which we have had sometime.
Having glanced through "Fire & Sea", there are some similar pieces, (and I do use the word loosely)
on page 72. Skruf and Sea Glasbruk 1950-1960's. The applied threading is similar in style.
It has a violet hue, and the threadding appears to be a silver grey/pewter colour.
Would be nice to have some info- TIA M & S