I bought these today although they are a bit the worse for wear, hoping someone will confirm that they are enameled? The stripes are a metallic silver while the flower panels are a mat-grey. I have nothing with a similar finish to compare them with.
When I saw them I thought they would turn out to be one of the patterns from the Royal company, but they're not from any of the sets so far identified. I couldn't find them in "Mysteries" either.
Although they are very solid and "blocky" very few of the lines are straight, instead of having geometric symmetry most of the faces are slightly out.