American oak desk chair 1920/30 Cosmo Paris

American office chair swivelling and tilting in oak around 1930. Large american armchair in solid oak. With its cast iron mechanism, swivelling, tilting and adjustable in height, it is very pleasant to use. Manufacturer's plate on the back and the mechanism is also stamped with the cosmo mark. Good condition except wear of use, I cleaned it, revived and restored the foot (see photos).