Nikon F Microscope-To-Camera Adapter Tube Model 2

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production year 1966
engraved «Nikon», Antiqua-F and «JAPAN»
bayonet fixed by 3 slot screws
microscope eyepiece adapter, black, white «Nikon», black «MADE IN JAPAN», red «S» & «D25», extension for high-eye-point eyepiece
3 rimless contrast filters, yellow, orange, green
focusing screen «C» type 4
English instructions (66.11.A)H
brown leather case,
embossed «Nikon»
original makers grey box