Set of 3 vintage 'Plona' chairs by Giancarlo Piretti for Castelli, Italy 1970s

A 1970’s set of three ‘Plona’ folding chairs designed by Giancarlo Piretti for Castelli. This is a rare edition with a molded seat in a smoked brown, translucent acrylic, the frame is made of chrome plated aluminium. Combination of the acrylic seat and the aluminium frame makes the chair light and easy to use. Light wear, consistent with age and use. The acrylic seats have some scratches as shown in the pictures.