Rare ceiling lamp with 5 glass balls, Ott international, 1970s

Height: 57 cm. Width: 62 cm. Depth: 62 cm. The lamp is equipped with 5 large sbulb holders (e27). The glass ball in the middle is larger than the 4 balls on the corners. On the edge, this large ball has a small (almost invisible) chip (see last photos). The lamp is marked: "ott international". Origin: germany, 1970s. Material: steel, copper, glass.