This is description of this part:
This is a tube-shaped lens assembly that is placed under the right eyepiece - in front of the mirror prism to the gray binocular head of the Carl Zeiss West Germany Standard 14 microscope
I apologize, but I don't know the P/N number for the head. It's the binocular head used on Carl Zeiss Standard 14 and Standard 16 microscopes. I noticed it also fits other Zeiss heads - but it definitely doesn't fit the 473012-9902.
What is this part needed for?
- if your head has delamination, chipping, cracking, scratching, or discoloration of the lenses
- if fungus (mold) has damaged the anti-reflective surface