Once again, most likely a Japanese collector through a buying service.
They don't mind Linear crap I guess. I'm serious when I say most of this vintage keyboard stuff may look interesting but feels horrible.
Most vintage keyboards are ironically still bad in contrast to modern ones. If the key feel isn't bad, the layout certainly is, and incompatible with any useful interface.
IBM really had the best keyboards around. But that shouldn't be a surprise. =)