Olympus microscope objective Mplan N 50X, 0.75, infinity, 0, FN22 UIS2.
Condition: Perfect, no lenses damages, no fog no fungus and no dust, like in the images.
Opened, used few times, like new.
Tested without a coverglass, as this objective should be used.
Infinity corrected, it works on many infinity microscope with RMS mounting standard.
If you have any question ask!