Some collectors do steer away from verdigris but since I am not a collector of this series I can't say monetarily how much it affects this particular piece.
Just an idea, search for Verdi Care on the forums and read up on BradThad's Verdi Care and give it a try if you'd like. I have had good to excellent results on several coins with verdigris. I do believe that some coins can be conserved carefully without affecting value.
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