I was going to guess an old Nikkor 55mm f/3.5 Macro, but the barrel that extends on mine is black, not silver, so I remain uncertain. It works great with my D5100; most any shot I take at f/32 at 30 Seconds comes out very well and the M2 Ring is fully adaptable.
The old Nikkon 8mm Fisheye is a valuable lens. You need a hand truck to carry it around though.