Square dish / bowl by Mari Simmulson for Upsala-Ekeby in Sweden. Mid-20th century, geometric pattern

Beautiful square bowl by the Swedish potter Mari Simmulson for Upsala-Ekeby in the 1960s. The bowl / dish is glazed in brown with white squares and white border. The bowl is signed UE for Upsala-Ekeby and "ms" for Mari Simmulson. Excellent condition. Width 22 centimeters