Vintage Viking Glass 15" Bluenique Vase

Vintage Viking Glass bluenique 15 in vase . graceful elongated silhouette. The rich blue color adds a refined pop to tabletops and shelves. No chips or cracks however there are some lines inside the vase towards the top where the neck is thin. This may have been an old water line (although I never used this as an actual flower vase with water in it... I had it for 20 years as a decor piece only). Last photos show close up of the lines. You cannot feel anything on the outside of the vase and that is why it appears to be in the interior which likely can be cleaned with the proper vinegar solution and delicate thin bottle brush tool) I don't want to try to clean it myself and it never stood out or bothered me . I do however try to be as thorough as possible when listing an item to point out any flaw or imperfection that I can see. I do look over my items with the magnifying glass as well.