Interesting that they are so close. Your 6471xxx has some black parts! ….a kind of "panda" model? ….special order like black paint S2 and S3?
Actually specimen #6471xxx is not mine, it is only in my Nikon F photo database. You spotted correctly a Frankenstein piece from a black body transplanted onto a chrome body! Some people would do any kind of bad things! If it were of any interest to restore it, maybe because one has a twin sister camera with an adjacent serial # (or a camera differing only by one digit, say 6471xxx and 6571xxx), a donor for the correct piece has to be found... Such couples are of greater interest to collectors, better than a single anonymous camera.
I have several low numbered cameras:
Two 640xxxx
Five 641xxxx
Three 642xxxx
NO 643xxxx
One 644xxxx
Two 645xxxx
Two 646xxxx
Two 647xxxx
and then several from 653, 654, 656,
658, 659, 660, and so on.
6 Red Dots so far.
It's still a long way to collect one sample for each group of 10000 cameras. I would have to have more than 120 cameras, but then there is not much difference between a 708xxx a 709xxx and a 710xxx, so I went another direction, searching for models with unique features (such as the lowest existing Apollo, or Questar converted cameras, or T models, or EP models, ...)
Ciao from Massimo