Rare penny sold for $1.7 million
>https://www.upi.com/Rare-penny-sold-for-17-million/57291285259401/
"This is the world's most valuable penny. It's the only known example of a 1943-dated Lincoln cent incorrectly struck in a copper alloy at the Denver Mint. Zinc-coated steel was being used for pennies in 1943 to conserve copper for other uses during World War II, and this one was mistakenly struck on a bronze coin disc left over from 1942. It took four years of aggressive negotiations with the coin's owner until he agreed to sell it," said Sperber, who obtained the coin for the buyer.