Set of 6 potter's plates 1970 in glazed earth signed

Spectacular! Very interesting set of 6 potter's plates circa 1970, flat with a slightly recessed rim, right from the 1970s, rustic and designer. Red earth glazed with blue and brown enamels, milky sky and earth to the black blue of the night, extraordinary. Pieces signed with a mysterious incised k and an upside-down r. Possibly scandinavian work without certainty. Intermediate size of 21cm at the heel and 17.5cm at the opening. Rim height 4cm and flat bottom. Stackable, splendid rows in an open environment.