Designed by Kari Christensen and part of the Tenera line, and from the late 1960s. I have seen other examples of this vase with the Aluminia mark on the bottom, but this has the Royal Copenhagen mark, so I assume it's a bit later production.
I love it when eBay sellers don't do their homework! This was posted as "Rorffrand" and I think I got a deal. The pattern is Polka. The designer is Carl Harry Stålhane.