what are the most expensive us coins?
['1913 Liberty Head Nickel. Most recently, the 1913 Liberty Head Nickel sold at auction for a whopping $3.1 million USD. ... ', "1870 Silver Dollar. Also known as the Seated Liberty, the 1870 Silver Dollar has become one of the world's most revered coins. ... ", '1927 Double Eagle (D) ... ', '1794 Silver Dollar. ... ', '1838 Half Dollar (O)']