Nikon F Extension Ring Model M
- production year 1963
- black
- metal tab, chrome, round
- blue aperture scale from 5.6 to 45
- «M» with slanted sides
- «Nikon F JAPAN»
- front bayonet fixed by 4 slot screws
- rear bayonet fixed by 3 slot screws
- matching 55/3.5 Micro-Nikkor 188496
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