Friso Kramer style drafting stool, architect chair

Friso style plywood drafting stool / architect chair with industrial enameled metal frame Details Manufacturer: Marko. Period of manufacture: 1970's. Attributed to Friso Kramer. Place of origin Netherlands. Materials: wood, metal, plastic. Condition Good, Wear consistent with age and use. Some stings on the seating ( reason of budget price) Dimensions: H 42.1inch. Diameter base 18.5 inch H 1,07 cm. Diameter base 47 cm Seat hight: 17.7inch until 26.7inch 45 cm until 68 cm Seat width: 15.7 inch, 40 cm Seath depth: 15.3 inch, 39 cm Technical details: Adjustable seating heighth by rotating the seating.