Hard to super discount the 40-70s key legends as someone else will come along at a show in 15 minutes (medium stars= yes...discount)
As a buyer xombos seem to always work with dealers.
I heard a dealer at chantilly show have a great comeback when asked "what's your lowest price on the psa 6 1958 mantle"...dealer replied " what would it take to get you into a 1958 psa mantle "....

...both buyer and dealer were smiling
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