Iconic Dedalino pen holder, from the DEDALO collection, designed in 1966 by Emma Gismondi Schweinberger. Manufactured by Idarco, the Spanish brand of Artemide. Looks a bit grayish on the photos but this is the white version.
This piece is now part of the permanent collection of the MoMA Museum of Modern Art in New York. The entire collection also deserved a special mention on page 52 of "L'Utopia du tout plastique," a leading magazine for the visual arts.
