Vintage chairs set of four - 80s design

Beautiful set of four vintage chairs with a very special frame. See the photos for all the details! The chairs have a different model frame than is normally used. The chairs are stackable. All chairs are marked made in italy on the seat. The set is in good used condition. The frames are neat as well as the webbing back seats. The seats of 3 of the 4 chairs are still good but not completely tight. The fourth has some loose spots of webbing but it can still be used. Dimensions approx: 52 cm length, 52 cm depth, 79 cm height and 46 cm seat height.