Today's vintage thrift find was a Dietzgen 'SharPoint' mechanical pencil pointer sharpener from the 1960s in its box. "For draftsman - engineers - architects - artists - accountants" says the box.
This requires a moment of explanation: This is not a pencil sharpener; this is a device to sharpen the point of an older-style 0.2mm mechanical pencil, now usually referred to as a technical pencil or drafting pencil (because "mechanical pencil" today refers to the kind with a thinner lead that one clicks forward like a ballpoint pen). It only sharpens the lead part of a pencil, so works with either a trimmed-pointy wood pencil or a standard technical pencil with replaceable leads such as this...
One puts a pencil into the guide (the spout there) and inside there is a small hole for the lead to enter, rather than a wide opening. Turning the top section like a crank rubs the lead against a fine friction surface to hone the point. Here's what it looks like inside the chamber, and the lead rubs just below the light grey ring:
I like the booklet inside, it's very well written on its usage and care. Here's the instructions on how to use it:
Surprisingly it was not in the display case and cost 1/4 of what the folks online want for a unit in its original box.