Some info I found
Nikon F2 Questions (FAQ) by Michael Liu :
"My serial number is 76xxxxx. What's significant about it?
The Amazing Kreskin (the amazing who?) says ... you have a chrome F2. Amaze your friends! Awe your coworkers! Tell them that if the serial number's second digit is an even number, the camera is chrome; if odd, the camera is black. The legend that the camera was made in the year shown in the first two digits is thus probably false, unless you think that Nikon made only one color per year. The major exceptions to this are the titanium versions of the F2, which begin with serial number 92xxxxx and have a black pebbled finish, much like the F3/T in black finish.
"Moose" Peterson says that early (71xxxxx and 72xxxxx) F2's have a small problem with the take-up spool ".....these can supposedly cause some frame overlap when using a motor drive (but should be fine if you wind-by-hand)...". I've received information in the past weeks that there do exist chrome 73's and black 74's. Perhaps Nikon changed the serial numbering with the 75's and later (which I do believe follow the even = chrome / odd = black system)."
If you are asking about the viewfinder, information there may be sparse.