I'm guessing original stock, with the checkering sanded off. The contours at the wrist look fairly swamped.
But I'm no expert, and could be wrong.

Does anyone think is is worthwhile to attempt to restore back to original (if possible), or is it's value not worth the expense? How about parting it out on Gunbroker?
Thanks, everyone, for your professional input. I do appreciate it.

Economically, the gun is not “worth it”. You would spend 4-5 times what the gun is currently worth and maybe 2-3 times what it may be worth when done.
But that is the case with nearly any lower grade gun, or most guns in general.

You do the work because you want to, not to make money. The gun may very well be usable as it is. That is an option too.

If it is mechanically sound I would just fix the stock as I suggested and
you have a SHOOTER Parker. More than a few of us on this site have Parkers that are not collectable nor valuable for some reason or other but we enjoy shooting them. Keep it, make some minor repairs and enjoy shooting and learning about Parkers. It may not be perfect but hey it is a "PARKER"
You stated your wife inherited it. Was it a family member's gun?

remove trigger guard and look for ser. no. stamp. That should answer originality.