There are actually 3 versions of the collection badge that I know of, two made in Sweden and one made in Norway.
I have just picked up the third version, made by Westins of Stockholm. It is a solid back, whereas the one made by Sporrong is hollow back.
Here are shots of the new one, as well as the three together, from left to right, the Westins solid back, the Sporrong hollow back and the Norwegian David Andersen.
