Here we have a Great Used Vintage "Olympus OM System Mount Tube Adapter Microscope Black - Made in Japan" In very good to great used condition - Not sure exactly what models this works on as I couldn't locate an exact match, so I am kind of guessing here.  There is no lens inside, just the individual parts you see in the photos.

Please visit my Ebay store at the above link. YES, We do combine items to save you on shipping costs.

Please let me know if you have any questions, and Thank You for your continued interest, support and business.