Hmmm....noticed something else for ID'ing kaypros......
If you look at the picture of the back of the 4/84 that Erik put up, the brightness knob says 'brightness,' has that icon of the sun, and also has that little graphic increaing...
Now...ONLY my '84's have that, including the K10/84, but the 10/84 doesn't have an '84' sticker on it, none do as I recall.
Now, the 10/84 and 4/84 use the same motherboard, but the 4/84 has the modem jack aaaaalllllll the way to the left (as looked at from the rear) which the standard K10/84 did *NOT* have, as it did not have the modem or RTC, which the K4/84 has. the 10/84 has the space to install all the components though.
Looking at my K10/83, the brightness knob just says 'brightness' in a different, slightly larger font.
So, i would assume an '84 chassis to have those two additional icons around the brightness knob.
I wouldn't go by just that, though. Much like Chevy, Kaypro *LOVED* raiding the parts bins, which is why the tech manual is like 4 billion pages long. They used no less than 3-4 different floppy drives in the 10's, so if your floppy drive died in your 10, you could probably pop in one from a 4/84/2x, and it would *STILL* be period correct!!!
T