I definitely don't know all of them, as there are literally hundreds of variations, one-offs, and custom modifications to the F floating around out there. These are a few of the more famous ones. A much nicer source of information is at Stephen Gandy's Cameraquest.
Red Dots are neither rare nor specialised enough to warrant their rarefied prices. They are slightly more exceptional than your run-of-the-mill F, but all later bodies (67xxxxx +) incorporate their "refinement" and a lot of earlier bodies have been modified to the Red Dot spec. Personally, if I had $1 000 US to invest in a collectible F (I'd look for an interesting lens, first off, but that's a topic for later discussion ...), I'd rather get one of the early (6400xxx) models to trace the evolution of the F; heck, for $1 000 US, I could almost afford an SP. One word of warning: for those of you shopping on eBay, virtually anything that is collectible will have an inflated price, whether calculators or cameras. It's nice to have whatever you want right at your fingertips, but remember that you're dealing with "experts", real and self-styled, who have plenty of money to throw at these auctions. Watch out for "shill" bidders; though eBay tries to control them, I have heard they're still operating.
The 1971 F High Speed delivers 7fps with the mirror locked up (regular F/F36 combinations offer 4fps with MLU). I am still sketchy on the details of this model, but it apparently ran off a (cordless?) pack containing sixteen "AA" cells (although 24V may seem like a lot of potential, the later F2 H-MD would use four MN-1 packs, for 30V of potential).
The 1976 F High Speed delivered 9fps for photographers at the Montreal Winter Games. Although similar to the previous 1971 model, the 1976 model reputedly came in a 250-exposure subvariant, although very few of them were produced. Whenever collectible F's are mentioned, and especially F High Speeds, I continue to hear the name of the late Jose Wu Chang; perhaps one of you out there would be so kind to shed some light on his collection. These cameras had a pellicle mirror.
Stephen Gandy knows a lot more about the KS-8xA series (apparently, different models were built by a single person, to fulfill a contract that EPOI had taken out with the military), and his much better page dealing with these cameras is the best reference that I know of.
Of all the collectible Nikon F's, I would most want this one (of all the collectible Nikon products, I'd most like a 300f/2.8 Preset Nikkor-H ED, but that's not happening any time soon). I feel that, along with the KS-8xA's and High Speeds, these are the most mechanically distinctive and, as such, deserve the highish prices I'm beginning to see for them.
With a lot of help from my friends:
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