HANS J WEGNER, a "JH 701" chair for Johannes Hansen, Denmark, 1960-70's.
Tubular steel, leather seat, wooden backrest with details of wengé, seat height 44 cm, height 71 cm.
Minor wear and stains.
Grete Jalk [ed.], "40 Years of Danish Furniture Design", 1987, vol. 4, pp. 300-303. 
Noritsugu Oda, "Danish Chairs", 1999, p. 120.
The model was designed in 1965.