Talk:John Eleuthère du Pont

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[edit] Purchase price of Penny Magenta

History's Lost and Found states that the purchase price was $850,000... [1] states 1980: Weinberg's syndicate sold the stamp for $935,000 (including buyer's premium) to John E. du Pont

Is the $935K the sum of $850K + $85K "buyer's premium" of 10%?