I can't say I've ever seen a nikkor lens in this colour so guessing this one is quite rare. http://www.ebay.co.uk/itm/Mint-NIKO...era_Lenses&hash=item3cc06f38c2#ht_7058wt_1396

Nikon have offered a few lenses in 'light grey' (their terminology) for a while. B & H used to sell them, and may still do so, but I don't know if these are produced continuously or in batches.
I read somewhere that they also made a couple of rangefinder lenses in light grey back in the 50s, but I'm not sure about that.
I think the Nikon name for the colour is actually "tropical grey", the whole idea being that the lighter colour reflects the heat better in warmer climes.

You are an idiot these guys spend years researching this and you dismiss it you haven't got a clue son nikon would love to paint there's White but that would be a patent infringement and they couldn't do it that's why you are left with under-performing lenses in extreme heat small boy