Chair by Gerd Lange for Drabert West Germany model SM 400K

Vintage plastic and metal stacking chair by gerd lange for drabert west germany model sm 400k with cushioned back rest, I think these are from the 80s.condition is good, used but not abused.red fabric is new. Measurements are ca: 77 cm high X 45 cm wide X 55 cm deep the seat is at 47 cm ! Weight 5450g. Two chairs can go in a 20 kg parcel dhl germany. Sku: 2560b22l.