Would anyone please suggest an ID for this 18.5cm tall blue and clear cased vase (are you allowed to use the term 'Sommerso' if it's not from Italy?)? It has a signature on the base - largely obscured by wear, unfortunately - the last four letters of the longest word is 'fors'. I don't know of any name other than Alsterfors, although the two letters previous to the four may be 'ng'. There's also an unreadable date.