I have never seen one, or seen a report of this error. Difficult to price. Should be interesting to see how this one performs on
ebay.
Personally, I would have preferred to see this one go to public auction, where some sort of professional opinion would have been included in it's auction description.
I am not going to bid on this coin personally, but if I did, my limit (with a bit more knowledge) would be around $200, but I don't know enough about this one.