Original painted birch and birch plywood.
Designed in collaboration with Otto Korhonen, owner of the Huonekalu- ja Rakennustyötehdas firm which produced the model, and is a precursor to armchair model no. 51/403, designed for the Paimio Sanatorium.
Literature: Pirkko Tuukkanen, ed., ‘Alvar Aalto - Designer, Helsinki, 2002, pp. 69 and 164
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