I checked the swan and saw it took an opening bid. Then I checked my piggy bank and saw nothing but ribs.

It sure is a beautiful swan.
I am never very comfortable attributing the mezza filigrana pieces like your vase unless I can find an exact match (shape, size, thread count). They can be copied fairly easily by glassmakers. So many companies have done things that look like the things Martens designed. The Martens book probably doesn't have all of Martens designs, so it may be him. Whoever did it, it is a nice vase.
Anita