Pair of Baumann rotating screw chairs 1960

Magnificent and rare pair of Baumann beech rotating screw chairs from the 1960s. Industrial style, they were intended as typist chairs. Beautiful vintage condition. Healthy, stable and solid set. The mechanism works perfectly with ease. They have been carefully cleaned and oiled with linseed oil. Note the patina is original. The varnish has come off in several places and several dents are to be noted, particularly on the legs (see photos). Dimensions L52xP52xH70-90 Seat L37xP40xH38-58 Base L52xP52.