Vatican Euro Coin Mule With Two Reverses A super rare Euro coin error, this piece is actually two reverses. There is no "heads." One side features a 20-cent design, and the other features a 50-cent ...

It might seem like a tiny aspect, but it can help this regular-looking 50 cent coin be worth at least 100 times its face value. (Source: Facebook) There are a bunch of 2000 Millennium 50 cent coins ...