This is difficult without a picture.
How to Add Images Check out this page to see if any of the marks resemble yours:
http://www.925-1000.com/Fnorway_marks.htmlHere's a few more possibilities:



The bottom scan has Tone Vigeland's VT mark on the right.
Many of her designs were manufactured by Norway Designs at Plus in Fredrikstad. That's Norway Design's mark on the left.
Regards,
Pat