typewriter shopping

I hit a few shops today and found ALL electric machines.  Two of them were pretty interesting and unused-looking.  I didn't buy them because, as we know, that way lies madness, but I'll try to recall some points of interest.
There was a"Super Correct" if I'm recalling that accurately.  Typical 60's SCM but with black accents.  It was loaded with a regular red/black ribbon so I don't know where "correct" came in unless it was a separate mechanism or had the "wrong" ribbon loaded.
 The 2nd was a Sears SCM (why are they following me?) with the same SCM body but a strange "power ribbon" that looked like a regular ribbon in weird enclosed spools.  I suspect the are motor-driven somehow.  That one had the book I really should have checked it.  The "Power Ribbon" switch had four colors around it - red, black, blue and green.  No idea how that works.
Other than those there were a few 80's ones and a lot of wedges.
online, I found this Underwood and I can't date it or decide if I want to bid on it:

So, if anyone recognizes that model I'd be grateful for any info.