at work someone dumped a PS/2, monochrome display, and of course, the associated 1391401. the keyboard is a 1987 model with left-side gray IBM logo, detachable (and missing) cable, and the older, more durable key inscriptions.
i haven't tested it yet, but since there are large cigarette burns on the case, i suspect it's seen a lot of abuse. my plan was to use it as a source of parts for the 1996 model M i got from wellington a few months ago. i've already taken one of its springs, and i think i might transplant the keycaps too.
but more interesting than that... a friend of mine who sees a lot of recycled computer goods says he's found a hyndai super LT3, a laptop he says appears to have a mechanical keyboard. sounds like it might be a seriously old piece of hardware, but then again, i can probably use it as a serial terminal. i just need to remember to pick it up before the next time he takes out the trash.