I recently purchased a set of three Iittala Tapio glasses, which are unlike the other vintage or new glasses that we have. I am wondering whether they are authentic. In the attached image, the one on the right is one of our original, purchased in box, glasses. On the left is the one in question. There are ridges in the base of the glass in dispute, the bubble isn't as refined, and the shape of the glass doesn't match either. Can anybody offer any advice? Thank you