Pair of tulip armchairs 1970 burke inc

Pair of very sturdy armchairs in fiber and white plastic on lacquered metal tulip base, black seat cushions, circa 1970. In used condition, some scratches but very good overall condition. 80 X 55 X 44 cm. I should point out that these are not knoll, at least not authenticated as such. But the quality and finish are top. Purchased at auction on drouot 2 years ago. They have been authenticated as burke inc.