Of course, the most famous is the 1933 Saint-Gaudens Double Eagle, with the Switt-Langbord Ten being taken back by the government. And somebody voluntarily just turned one in a few years ago. Right behind, I'll put the 1933 $10 Eagle because technically only 4 or 5 were legally released and the only reason the whole batch isn't stealable is because the government can't ID which left legally and which didn't. Talk about a dumb/weak argument. Post your coin, pattern, or whatever that could be stolen back by the U.S. government if not for the stink it would probably raise.