A mid-century casserole or oven dish, designed by Marianne Westman for Rörstrand, Sweden. She worked at Rörstrand during the 1950s and 1960s and this design dates from 1956. The name of the design is Red Top (it's missing its red top as you can see). The tableware was made of flintware with gently rounded shapes, checker patterns, and red accent colours. The set consisted of about 15 tableware items ranging from pots and jars, to butter dishes and plates.
The dish is from the 'ovenware' range and is model number 106. Simple Scandinavian diamond/checker graphics all round externally, black on a white base colour. (If you look closely the black diamonds look like free-hand zig-zagging fine felt tip.) Both a useable kitchen item and a decorative pan - ideal for both oven cooking/baking and serving.
Pan body is 15.5cm wide at the base, 18cm at the rim, and would hold about 2 portions of a main or 4 portions of a pudding (or a big individual bake). 7.7cm tall to lid rim and 26.5cm longest with handle.
Very good condition for the age and era. No crazing or chips, clean inside. Stamped to base with the logo. 
Price includes P&P to the UK.