Pair of vintage chairs by Harry Bertoia Knoll 1970s

Pair of black lacquered chairs (no rislan, indoor chair). Model from the 70's, knoll edition, these two chairs are made of a steel wire mesh structure on thin metal legs. Unstamped vintage edition, knoll has been stamping the chairs since 1995 only. Thick and comfortable. Very good condition but beware it is a vintage product with some traces of time.