I have just bought a small job lot of microscope related bits on ebay and this unusual objective was amongst them.
Made by Carl Zeiss of Jena, it is marked OBEKTMARKIERER PLANOBJEKTIVE TUBUS with an infinity symbol. The tip looks like carbide and is not dead sharp, but has a tiny radius, and it can be offset from central to about 4mm diameter, calibrated in 0.25mm steps. The whole lower part can rotate and has a rest position and cams downward about 0.5mm when turned. A specialised tool for marking metal surfaces with a ring, it is not sharp enough to mark glass without breaking it
I wonder if it should be sharp, and has been rounded by misuse/wear, or is a blank awaiting sharpening?
Here’s an example with a diamond point, intended for marking cover slips on slides, so the observer can find something of interest again later. https://microscope-antiques.com/watsonom.html
That Watson with the diamond point is spring loaded, the CZ is not, and would be hazardous if a brittle surface was touched. I will have a look at the tip at about 20-50X and report on the exact profile.
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