Set of 3 Nesting Tables by Giotto Stoppino in black for Kartell

Set of 3 nesting Tables in black ABS plastic. Late 60s. Attributed to Giotto Stoppino / Kartell. Each labeled with small sticker “Made in Italy”, but no other markings present. Vintage condition with signs of use and age. Surface with use and scratches. Please see photos. Dimensions: Diameter: 43cm for all tables. The height is different: 41cm, 35cm, 31cm.