Love the colour, but also love the face that it's not unlike a Holmegaard vase for your ceiling. The Peil and Putzler ceiling lamp that is.
Out of the 1970s (as you might have guessed), it is actually glass rather than plastic in construction, with the orange outer contrasted by a white inner glaze. The bulb casing is apparently fitted with three retractable prongs, which thread through the lampshade.
Condition? 'Very good' according to the seller, with a 'few very small chips' on the bottom rim of the lampshade on the white glaze, but 'hardly noticeable'. If you want it, right now it's at 99 pence.