German Jupiter 2 Pencil Sharpener, Manufactured in the 30's. Well preserved and working.
Lathe Pencil Sharpening Tool... - YouTube
We re-engineered a 140 year old abrasive pencil sharpener. Metal working prototype, after tweaking the plastic version I shared a while ago. : r/MechanicalEngineering
Crawls Backward (When Alarmed): Boston KS Pencil Sharpener Restoration, Pt. 2