The design on this plate was created by Inger Waage. She was born in Stavanger in 1923, joined Stavangerflint in the early 1950s, and was perhaps the best known artist at Stavangerflint.
The back is marked with the Stavangerflint logo, Norway, Silkscreen, Hand Painted. It looks like the black outlines were silkscreened, and the colors applied by hand. I especially like the very loose and abstract application of the colors.