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Over the last 24 months the median price was $23,040 including buyer’s premium (middle half $8,960–$43,840, n=66). The auction record is $460,800 for Experiments and Observations on Electricity Made at Philadelphia (2026, Sotheby's). Source: OpeningBid, an independent auction-results database.","title":"Benjamin Franklin value: auction records & prices (updated Nov 2026)"}}