Nittsjö Keramik is a Swedish pottery that was started in 1843 as a brick manufacturer. Today they produce dishes and serving pieces, as well as holiday decorations (Rolf Berg has provided some tomte-themed designs). The Nittsjö website is in Swedish, but it gives a good overview of its products. They seem to change designs often, and I believe this is older (1980s or '90s). We have a few of their bowls, and they are sturdy and heavy.
This small bowl was an eBay find. The bottom is marked with the company name, Sweden, and a shape or design number.