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identify7Sinatra is a name known by most people, Nagy by far less. Purchasing a card with the provenance listed on its holder is a form of "buying the holder".
Although both the provenance and grade have staying power, depending on whose provenance is associated with the card, it may increase or decrease in value over time. That is, if Mr.X was identified as Sinatra, for example, the value of that holder would likely outperform the same card holdered in a Nagy identified slab, because Nagy's importance will diminish as new unknowing collectors enter the hobby and the dinosaurs leave; while the Sinatra legacy will be reinforced by society. imo.