The oldest challenge coin known in existence is that of the 17th Infantry of Korea commanded by COL “Buffalo Bill” Quinn. These coins were made during the Korean War and were given to its members from 1950 to 1951 to mark their tour together. On one side of the coin is a picture of a buffalo with the date 1812, which signified the year the unit was formed. On the other side was the 17th Infantry patch with the dates 1950 – 1951 and the word Korea to signify the tour. The cross and fort icon represent the units heritage which started in Cuba during the civil war. This coin is recognized as one of the oldest and most valuable challenge coins in circulation. Very few remain available and most are thought to be in private collections.