Made in Japan with point adjustment:
https://carl-officeproducts.com/products/a-5-royal-pencil-sharpener/

Remove the helical blade from rotor, if you can, by unscrewing the rod that holds it in place. Wear a thick leather glove on one hand. Place 300-400 grit sandpaper strip on hard flat horizontal surface in front of you. Hold one helical blade(cylinder) with long screw through it from the ends between your thumb and middle finger so that blade rotates freely. Lay the helical blade against the sandpaper while holding it. Place two or three fingers of your gloved hand on top of blade to push down against the helical blade. Now pull on helical blade so that it rotates while being pressed down against sandpaper. The blade will bite into the glove and cause it to rotate. Repeat until the blade has rotated a few times. Replace helical blade. I'm sure there are other ways, but that's how I do it.

There is a youtube video of an older man putting the helical blade against a sanding belt. Takes too much metal off.