Estate Sale find. Clearly labeled Carl Dietz with three lenses x100, x200 and x300. I have not been able to find any information on the manufacturer or product line. Does have the mirror, but it is not in mint condition.  I did shine a light under and look at a slide with each of the three lenses so they appear to work fine (given good light).  The turn knob raises and lowers the scope fine.  Does not include original box for microscope. Measures 7 5/8" in lowest position.