I refilled with some fuel today at the server and was handed a 1966, 20 cent coin. It was very dirty looking and old. I showed it to a mate that told me it could possibly have some value, so I instantly googled on the phone. It was annoying to discover that it was not something special, but I did not know about the 'wavy' 20 cent coin until that day. Many more people know what I am talking about? I wish it was one of them but oh well...