A woman found a message in a bottle and it turned out to be one of many that a biologist threw into the sea for ocean current research. The postcard inside promised one English shilling as a reward, and the woman mailed in the postcard and received the shilling! The find is now recognized as the oldest message in a bottle ever found.
http://www.theguardian.com/world/2016/apr/19/message-bottle-washed-ashore-108-years-worlds-oldest
http://www.theguardian.com/world/2016/apr/19/message-bottle-washed-ashore-108-years-worlds-oldest