Industrial Dutch adjustable swivel chair - 1950s

This vintage Industrial factory machinist workers chair / stool was produced in the Netherlands circa 1950. The piece sits on a four-legged metallic base on rotating knobs, and features a bentwood seat and backrest with age-related patination. This chair is adjustable in height from 46.5 cm to 67 cm, and the backrest is adjustable backwards and forwards and in different heights, for comfort.