Someone has been trying to sell one of these locally claiming it is worth US$4000-6000 since only 300 were made . He is trying for about $2500 and I'm wondering if anyone here considers it worth something . This is what he states : " This lens was introduced in 1952 and according to Robert Rotolonis book "Nikon rangefinder" only about 300 were ever made - making it one of Nikons rarest lenses. At around 19 pounds (30 including the box) it is also one of Nikons heaviest lenses. I have had this lens cleaned by Auckland Camera, I have been told that the lens is scratched. The body of the lens also has a number of scratches. Which would be normal for examples of something this heavy and old. Comes with Lens hood, F adapter and hand crafted wooden crate with lock but no key. According to the McKeown's Price Guide to Antique & Classic Cameras The 500mm f5 black is worth between $US4000 - $US6000 with original wooden case. From around the lens. Nippon Kogaku Japan no.647120 Nikkor - T.C 1:5 f =50cm " I'm not allowed to post links to an auction so if anyone is interested in the link pm me .