Definitely Scandinavian blue glass. Not likely to be Holmegaard. May be by Kosta or Orrefors or even Stromberg. The larger factories sold blanks and others engraved decoration and on sold them. If Jennifer Silverman is a member she will most likely know the engraver. If you get no joy here you could try 'Scandinavian Glass Collectors' group on Facebook - I know she is a member.
Ross