The 58mm Noct Nikkor is an amazing piece of glass, but borderlines on unobtanium. Nevermind its Leica class price for a second, Nikon could never make enough of them. Even by their infamously low production numbers, the Noct Nikkor was a small batch lens. The newer AI-s versoion commands a tidy sum on the used market, but the people lucky enough to own a copy seldom seem interested in parting with it. Our own KG has a pile of classic Nikkor glass, I wonder if he's got one?
Unsurprisingly, K-Rock got to play with a copy a while back and jizzed in his pants over it.