Hard to say if that's the only piece you have.
It is indeed an
H/O version. You can see in the detent where it's in drive currently (which allows you to operate the second gear shifter), and if the second gear lever is forward, you can then push down the button on the left rod and slide it forward to the lower detent stop in OD, then let go. Then you can just shove it into neutral from there. Then you slightly push down and move it to reverse, then push down on the button further to get it to park position. The yellow dot helps confirm a "factory" (C&C) piece.
$600-ish fair market value. That's where I see it. You can justify it being lower or higher however you like, but there's nothing else with it except just the shifter, then everything else would need to be sourced. And that can add up quick. I noticed a few little scars on the shifter rods, the knobs will need replacing, and possibly the chrome buttons. They likely function, but they're not cosmetically appealing. Depends on if someone is just wanting something to work or restoring their car or wanting a "show" piece.
If you had a package deal it would be more, obviously. The chunk you have is, IMO, is likely worth around $600.
I have new OEM black knobs for them in case anyone who buys it from you needs some. At a much better deal from those other people that sell them.