Set of 4 Plia chairs by Piretti for Castelli

Set of 4 folding chairs: Plia model by Giancarlo Piretti for Anonima Castelli. 1 chair with Plia Patent Anonima Castelli Italy stamp and 3 chairs with Plia Castelli Italy stamp. 1970s/80s. Seats and backs in smoked polycarbonate (1 chair slightly more yellow). Good overall condition despite signs of wear over time (scratches and small dents on the plastic). Seat height 44cm. All pads are present and they need to be finished cleaning.