^It's actually the opposite. And, prior to the 75xxxxx serial block, they were intertwined, just like F bodies and Nikkormat/Nikomat FS, FT, and FTn bodies. Nikon used that practice on FM bodies above the 21xxxxx block, FT2/FT3 bodies, the EL series, and everything else through the lower 8xxxxxx serial ranges of the FM2/FM2n bodies. When Nikon switched to the 85xxxxx serial, Nikon started using even/odd serial numbers for both black and chrome bodies again. F3, F4, and F5 bodies didn't follow the even/odd second digit convention, nor did the EM, or the N-series bodies, since they were 99% of the time black.
After the 74xxxxx serial block, Nikon F2 bodies beginning with 75, 77, and 79 are all black. Bodies beginning with 76, 78, or 80 are chrome.
My original F2 was a body in the 713xxxx serial range. Black. I owned another 713xxxx serial body that came from BradleyK. Chrome. I've owned six 72 serial F2 bodies. Three were chrome, three were black. I've owned one 74xxxxx body. It was black. But, I've seen a few chrome 74 bodies in person. If I go above the 74xxxxx range, I've owned one 75 serial black body (now belongs to Ralph Javins), 10 77 serial black bodies, a 78 serial chrome, 5 79 serial black bodies, the latest one being a body built in January 1980 and being the one I own today, and one 80xxxxx serial chrome.
My bodies, by breakdown of month/year, as per Sover's site:
F2 by period of year:
1972 (period unknown): 7131xxx; 7134xxx; 715xxxx
1972/11-1972/12: 7208xxx; 7217xxx
1972/12-1973/1: 7221xxx
1973/2-1973/4: 7244xxx; 7249xxx
1973/5-1973/8: 7280xxx
1974/6-1974/8: 7424xxx
1975/12-1976/5: 7556xxx
1976/11-1977/2: 7715xxx
1977/2-1977/5: 7729xxx; 7730xxx; 7731xxx
1977/4-1977/7: 7745xxx; 7747xxx
1977/8-1977/12: 7874xxx
1977/10: 7760xxx; 7766xxx; 7768xxx
1978/4-1978/7: 7792xxx
1978/7-1978/10: 7902xxx
1978/9-1978/12: 7910xxx; 7915xxx
1979/6-1979/9: 7941xxx
1979/7-1979/12: 8050xxx
1979/12-1980/1: 7960xxx
Yes, I've owned a few F2 bodies.
F3 and FA/FE/FM series bodies made after early 1980 have a four digit code inside the film back area. On the F3 bodies, it's behind the hinge, on the other bodies, it's in the film chamber. First number is usually the month (1-9, O, N, D), second number is the last digit of the year, third is a letter signifying what version a camera is, and the final digit is the revision. Newer bodies, like the F4, F5, etc, require some calculations to be made to figure out when they were made.
-J