Antique industrial watchmaker/jeweler's lamp goes up and down

Antique industrial watchmaker/jeweler's lamp goes up and down, from the 20s and 30s. Authentic so-called "swan neck" lamp, metal structure. The conical lampshade is made of green enamelled sheet metal (original color) on the outside and white on the inside. It is articulated and can be oriented along different axes, it can also slide along the stem as needed. It is switched on by pressing the black button, the base is made of cast iron ensuring good stability for the whole. This lamp works with an original classic bayonet socket. A very beautiful classic and authentic model. Height: 51 cm base diameter: 13 cm shade diameter: 22 cm.