I don't know - if you look at the old OSs listed, OS2 and VMS are still in use (sadly I see some of them) and Amiga is being redeveloped and supported in an odd sort of way. I'm not so sure that this is that old and in fact may be contemporary.
And Jaguar (10.2x) is two revisions and three years old. I have Tiger and Panther in some places where we have OS X.
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