The first thing-- (obviously) this board *is not* a Model F. It is an Oak keyboard, but not like the AT Model F. This guy has completely different DNA. The membrane has etched into it: "FTM" and "Full Travel Membrane." It is not a "frankenboard" either-- the case cannot be swapped with a standard 83-key PC keyboard, it is all new. Notice the shape of the board's keys and plate-- the plate is flat and the key row heights are different.
I'm not sure what this means for a true Model F for the 5531. I've yet to see any examples or documentation of such a thing, while I've seen many examples of this board on eBay... ???
Board is really cool and well made. Key movement is smooth and there is no wobble at all. Swiches look unlike anything I've seen so far. Keyboard uses a membrane just like the Model M-- plastic front riveted to a metal backplate. Backplate is aluminum. Keyboard is very light and ridgit. It was assembled sometime very earliy in 1985. Almost all parts are dated 1984, except for the OAK label on the backplate assembly. It is dated 8504, which of course should be Week 4 1985.
The Model F and Frankenboard entries in the Wiki need to be upated.
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