Note that I've changed the wording of my entries on the 1987 512Ke (like Mac128 says, until another 1987 M0001E surfaces we can't really be sure -- this is basically just my prediction of what it will be based on the only example I've ever "seen" -- note that this sort of seemingly-authoritative-statement-actually-based-on-speculation is not something I make a practice of doing -- the evidence for most everything else on the site is conclusive), as follows:

There were two generations of Macintosh 512Ke [M0001E] machines:

Beige machines produced in 1986 have a label on the back with no copyright date. They came with the M0110 standard keyboard and contained first-revision Macintosh Plus ROMs.

Platinum machines have a 1987 copyright date on the label. They came with the M0110A extended keyboard and contained second-revision Macintosh Plus ROMs. These machines existed, but I don't know if they were ever sold retail. They may have only been sold through educational institutions.

Note: I have never seen a M0001E with a 220-240V power supply.

[...]

Sales of the Macintosh 512Ke continued until September 1987. The design of the outer box was changed in early 1987, but evidently the content and design of the owner's guide did not change. I don't know if the 512Ke was sold retail after January 1987 (see above).

[...]

Sales of the Macintosh 512Ke continued until September 1987, but evidently the software bundle did not change after June 1986. I don't know if the 512Ke was sold retail after January 1987 (see above).