Absolutely!
Especially IBM and DEC!
Based on memory alone I think that’s a Model M. Or J but it’s too low for J in my memory. Not sure what revision.
$50-$150 is fairly common for them if you can plug it in and all keys work. More with good springs on each key.
Yes they are heavy. Some of the best keyboards ever made. Gamers like them a lot. Fast typers like them too. Like myself. My wpm rate is too fast for low end modern keyboards so I actually need mechanical. And these are nicer than most modern Mecs.
Those are the grail keyboards along with early Apple ones. And the space cadet keyboards. Which can fetch nearly a thousand or much much more.
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And no, the board is almost certainly a display driver. That’s not 100% but I’d say 95% sure.