Set of 4 turquoise vintage design chairs from Metaform

Dutch description:
Set of 4 vintage design chairs / dining chairs with high quality metal frame and turquoise upholstery. Designed by Karel Boonzaaijer & Pierre Mazairac for Metaform, the chairs are still in very good condition. The dimensions are as follows:

Width: 52 cm
Height: 47 cm (seat)
Height: 78 cm (back)
Depth: 52 cm

English description:
Set of 4 vintage design dining chairs with metal frame and high quality upholstery (turquoise). The chairs are designed by Karel Boonzaaijer & Pierre Mazairac for Metaform, and are still in very good condition. The dimensions are as follows:

Width: 52 cm
Height: 47 cm (seat)
Height: 78 cm (back rest)
Depth: 52 cm