Lots of winds and waves in the west side of the city.

My camera is F2 9201294. With a matching DE-1 finder.

It's without any doubt the most robust Nikon camera I have ever used, and easily capable of breaking my ribs instead of shattering when mishaps occur in the field. The assertion is field tested, by the way

Searching  for food, 600pf

I cannot find any sort of serial-number reference for Nikkormats, but the few places that talk of serial-numbers only mention that the FT2 was in the 5XXXXXX range.  Your 570XXXX number is indeed very high compared to other ones listed out there, so it does seem unique.  I can only suggest contacting Roland Vink who maintains a serial-number database for Nikkor lenses (and some Nikon bodies): He might have some insight into your FT2. 

I would totally rock that FT2 and take it out for a spin rather than turning it into a shelf-Queen.  Perhaps consider an ever-ready case to protect the cosmetics.

I did not get overexposed results with my setup with or without FV lock. I don't have an SB-800 to test.

The SB-800 did not expose correctly with a Godox/Flashpoint set of a trigger and receivers in iTTL mode unless curiously I used FV (lock) whereas my SB-700 did. This setup worked perfectly in manual flash mode and the exposures were great with the SB-800 and iTTL but only with the use of the FV (lock). The camera was a D850.

At some point I'll have to get an SB-5000 or twoj but until I get a mid range zoom in Z mount.

The SB-800 is an interesting speedlight. I believe it is compatible all the way back to the FE2 but it is showing its age.

Dave