Office Chairs Johannesburg now offers an executive range of chairs. The Mandeville Executive chairs are made in South Africa carrying a 5 Year Guarantee and are upholstered in Genuine Bonded Leather. The Mandeville range is available in both white and black leather carrying a delivery lead time of 20-30 working days. Executive office chairs carry a 5 Year Guarantee and are delivered free of charge to Johannesburg, Centurion & Pretoria.