(My first post here, but I've been doing b/w nonstop since the early 1960s, my parents were professionals with their own studio from 1946 to the early 2000s.)
I have many of these lenses; most have been in my family's possession since the 60s/70s... and they've continued to work beautifully without ever having been serviced. I especially love the 105/2.5 and the 35/2, but my most-used Nikkor lens hasn't been mentioned yet...
The Nikkor 45/2.8 GN.
It's HALF the size and weight of any other non-AI lens - a pleasure to carry - and crazy sharp. We got ours back in 1969 for its intended use, automatically adjusting the aperture as you changed focus when using manual flashguns. The arrival of "self-quenching flashes" like the Vivitar 283 a couple of years later made that function obsolete... but the GN still shines as a pancake lens. I'm really surprised that it isn't better known, either as a unique collectible OR a very small, excellent shooter.
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I took these a few years ago with a Nikon F2 (with meterless DE-1 prism, just estimating exposure) on Tri-X, developed in D-76 1:1, negs scanned at 1800 dpi.