Pair of Diamond armchairs by Harry Bertoia 1960's

Diamond chair 'harry bertioa' armchairs for knoll 1960's (created in 1952), satin black metal, original light brown tweed cover -h.75 seat basket made of wire and attached to the seat basket with a hook. Wear & patina consistent with age and use, some oxidation and welding accidents restored, screws changed at different times. In their original juice, to be repainted....or not!!!. Clean seats, dry-cleaned (this no longer needs to be done).