look here (from Roland Vink's links):
https://www.cameraquest.com/nrf3518b.htmLooks like you found a little gold mine...
Quote:
This is one of the rarest of all Nikon lenses with a production of only about 100 lenses.
In other words, it is rarer than than Nikon stereo lens, almost twice as rare as a Nikon S3M, seven times rarer than a Nikon One, fifteen times rarer than a Nikon rangefinder motordrive,
thirty times rarer than a 50/1.1, fifty times rarer than a Black Nikon Rangefinder!
It is only 2 numbers short of the highest documented serial for this batch (highest: 351868)
Add to it the fact that it's a misengraved lens, it's going to be even more valuable!
Ciao from Massimo