Pair of vintage mid-century armchairs, designed by Jiroutek, for reupholstery

A pair of beautiful vintage mid-century beech armchairs, designed by architect Jiri Jiroutek and made in former Czechoslovakia in the 1960s.
The wooden frame, arms and legs are in excellent condition, with some signs of wear associated with age. As shown in the pictures, the webbing under the seat has been replaced at some point and it is strong; however, other elements of the upholstery have perished with age and would best be replaced.