Vintage chairs set of four stackable 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 frame model than is normally used. The chairs are stackable. All chairs are marked with made in italy on the seat. The set is in a 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. 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.