Sometimes, the most incredible discoveries happen in the most ordinary places. For one unsuspecting café owner in Pennsylvania, that place was a simple tip jar. What looked like a common penny turned out to be a 1955 Doubled Die Penny—one of the most iconic and valuable error coins in U.S. history. That tiny piece of … Continue reading Tip Jar Surprise: 1955 Doubled Die Penny Sells for $240,000 at Auction