Interesting lamp, which, to our knowledge, went out of production sometime in the 1970s. Making this Artemide Triedro clamp light by Joe Colombo something of a rarity.
It was actually designed in 1970 and we believe, made by Stilnovo in Italy, although the seller is saying Artemide. That might be a mistake though, you might want to check. Anyway, it's a versatile light, using a clamp to fit pretty much anywhere – even on a stand if you want a more traditional light fitting. The 'shade' is made of sheet metal, the clamp tubular steel and the bulb, as you expect, sitting in the middle directing the light.
We've seen these listed for big money in the past, so at £75 (right now), this might be something of a bargain. Although that's for you to decide.