I just noticed that this lens has come up for sale on Astromart and since I have mentioned a number of times that I have used such a lens for wide field H-alpha views I think I should comment on it. The item for sale is somewhat different than my version as it is the last design iteration and mine was one of the first ones made. Quoting from the Nikon Compendium by Hillebrand and Hauschild: "It was optimized in 1986 and fitted with a two-piece lens hood, a slip-in gelatine filter holder, and an integrated UV-filter in front of the first element." In addition, it is slightly longer and 10% heavier than my version. I have never seen this version in person so I am just going by published specs.
I am not a member of Astromart and do not know the seller and, quite honestly, had never paid attention to the fact that different versions of this lens had been made. As I have said before, I really like the one I have and use it whenever the target is not too high in the sky.