https://www.google.com/amp/s/www.dailymail.co.uk/news/article-15387351/amp/Rare-final-pennies-minted-US-sell-16-7m-auction.html
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The most expensive lot of pennies was sold for $800,000 after it was deemed the 'very last' cents struck, which also included the three sets of cancelled dies used to strike the historic series. Mint dies are tools used to press the design into the blank coin material.."