His S3 Olympic Black is about 3x what one is going for an an Ebay BIN right now. With the S3-2000 and SP-2005 out, the originals are not bringing in these kind of prices. It looks like a collector is consigning them. I have bought from Samy's before, they were quite honest. Of the cameras shown, the Nikon I with the collapsible 5cm f2 lens actually has a shot at it. They should list if the SN of the back matches the camera. On the Nikon I, Nikon M, and Nikon S that is important because the back had to be adjusted with the film gate for the film-flange distance. So the Back has a Serial number to match it with the body. The Nikon S2 sets the film-flange distance with shims under the helical. Early S2's had SN's on the back, probably from force of habit. It did not matter, and you can inetrchange backs on later Nikon RF's. But on the back of my early S2 (the 219th) there it is, the SN to needlessly match the back to the camera.