Industrial swivel stool in wood and iron with 4 legs, 1960s

Vintage industrial swivel and adjustable stool with four legs. The frame is made of gray iron with rubber feet and a footrest, and the round beech wood seat. Adjustable in height from 52 to 62 cm, it shows natural signs of age, particularly on the back of the seat. The height adjustment screw is worn, causing the seat to wobble slightly. Cleaned and treated with iron varnish and wood wax.