That is the "Mighty Mouse"
https://deskthority.net/wiki/Unicomp_Keyboards
https://www.reddit.com/r/MechanicalKeyboards/comments/12o5ej/the_ibm_m4_unicomp_mighty_mouse_and_ibm_m41_a/
Yeah, I saw that, and wondered if that might be what this was. However, it says (my emphasis):
The Mighty Mouse is Unicomp's branding for the IBM Model M4 and M4-1 keyboards...
And you'll notice this board says "Model M", not "M4" or "M4-1":
Or maybe Unicomp didn't bother being more specific, as IBM or Lexmark would?
[Note: I've placed the next two images outside their quotes, as apparently GH won't let me re-attach the original images so they appear here rather than the words "Attachment Link"]
Also this keyboard definitely is rubber dome...
Are you sure? When I was trying to determine that, I found
this 2011 GH thread where
ch_123 posted:
The SpaceSaver is an IBM or a Unicomp?
As we all know, the IBM Spacesaver has rubber sleeve switches.
...and
xwhatsit replied:
That's the IBM M4; Unicomp's Spacesaver is an old IBM Japan keyboard design but they've fitted it with standard M-style buckling springs...
Also it appears to be missing the SDL cable... Here is mine.
Yeah, but yours is a trackpoint. This one isn't, so it wouldn't need the special double cable—it'd be like any IBM board that'd need an SDL cable obtained elsewhere. Of course, whether that would get it working or not is unknown. (Again, what's the Ethernet port for, and is it mandatory?) And if it
is rubber sleeve, not buckling spring, I doubt many people would care about it.
Anyway, you've got me on all that... I just posted this because I'd never seen one, it seemed cheap, and I thought someone here might be interested. I'm going to stop typing about it now, okay? Cheers!