Oh yes, and apparently you can still buy them[1]. Mine was blue and probably a different brand (Faber-Castell, maybe) but otherwise looked the same.

I didn't use it much for drawing, though, because I liked the French Curves (or Burmester Schablonen, as they are called in German) much better. The lead ruler, on the other hand, was fun to play with during boring lessons, I like to think of it as my generations fidget toy.

[1] https://www.xn--praehistorika-archologenbedarf-dtc.de/produk...