At the other end of the spectrum: I bought one of these Russian KL-1 pocket-watch slide rules: https://www.sliderulemuseum.com/Manuals/KL-1_RussianCircularSlid

At the other end of the spectrum: I bought one of these Russian KL-1 pocket-watch slide rules: https://www.sliderulemuseum.com/Manuals/KL-1_RussianCircularSlideRule.pdf https://www.sliderulemuseum.com/Manuals/KL-1_RussianCircular... (I now need reading glasses to use it- so annoying).