1930s workshop lamp

Old workshop lamp. Diffuser hinged on a small arm. Slides a vertical shaft, 2 tightening knobs. Metal, gray and khaki color, marks and traces, see photos. Mounted on a wooden base, see photos. 57 cm high. Diffuser 14 cm in diameter, adjustable from bottom to top Bayonet socket (bulb not supplied) Used condition, old electricity, tested works on 220 V.