Around $500

You might squeeze $800 out of it to the right buyer.

$800-$900

I agree with $800 to the right buyer....A Black Hawks fan...Being in metro Detroit I would not want it for much more that $500. Of course any hardcore Hockey fan who also wants or owns pins would likely love to own one.

$750/$900 But consider putting in storage so that you may have this as a new game in the collection a second time around.

EK77 spot on. I purchased my BOPP locally (San Antonio), partially working, for $750. Willing to pay a bit more due to the pins history, overall condition and no shipping costs incurred. Pin owner purchased machine from a retail/coffee shop in Switzerland while residing there, over 25 years ago. The individual relocated twice, to Canada and then Texas, before this exchange.
One of my favorite Bally early SS era pins. Looks stunning when restored. I have an NOS BOPP backglass and CPR playfield and plastics stored away for this project. This is the era I first started playing pinball while tagging along with my father on league nights at the bowling lanes. Sadly, my father has passed away. I have this treasure as a recollection of his time with our family. This will be passed down to many generations to follow. To me this pin is priceless!