Three Egg Cups Sigvard Nilsson for Söwe Konst 1950s

Set of three egg cups by Swedish designer Sigvard Nilsson for Söwe-Konst in Sweden  in the 1950s. 
 
Two lined in red plasic, one in green. All three are stamped by the manufacturer, the green one is slightly older and remains the early Sigvard Nilsson logo with initials.