This is an early version of Nikon's famous 105mm f/2.5 lens. "Nippon Kogaku Japan NIKKOR-P". Good focal length for astro work. Looking to sell as I now have a Nikon macro 105 and 4 other lenses in the 85-105 range. Will work on your Nikon F or F2, maybe others but make sure. Non-AI; as far as I can tell it is the very first version of this lens ever produced. Pictures on request. The only flaw I can find is some slight wear or oil on the tips of 3 of the aperture blades when viewed from behind. Glass unmarked, no dust or anything inside. $99 plus shipping; may consider offers. 5 day return if unhappy.
Quoting Nikon System Handbook, "...quickly caught on with the photjournalists stationined in Japan after the Korean conflict in 1959. It was considered by many as the best lens on the market at the time (many still swear by it)... has become the standard for portrait work."