This is probably the perfect forum for such a question. That, being said, there are a number of places/people who could offer an opinion of value but in the end, only the sell price will establish an actual, indisputable value.
I don't know if they offer such a service but I think James D. Julia's Auctions has been right on on Parker values over the years in their pre-auction catalogs and I would trust their judgement.
Good Luck
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