508 swivel chair by Geoffrey Harcourt for Artifort, ca. 1977. Measurements: h x w x d = 71 x 68 x 73 cm, seat height 39 cm.
Considering it’s age this chair is still in very good condition. The Ploeg fabric is still in good condition; no cracks or holes in the upholstery, some minor discolouration on the backrest.