Lamp foot, old painted glass bottle

Vintage lamp stand. At first glance it looks like ceramics; it is actually an old glass bottle painted with a resistant paint, which has been transformed into a lamp. I do not know when the transformation took place, the bottle dates from the 50s or 60s. One can distinguish the inscription "registered model" under the bottle. The color is faithfully rendered in the photo: it is celadon green that pulls slightly on the sky blue. Everything works well, you can change the wire if you want because the electrical system is old. Bulb not included (screw bulb). There is a screw ring that allows you to fix a lampshade, if you want to put one. Height of the foot: 12 cm, total height with socket: 17 cm. Very good condition, no lack.