"Often using little more than a pen-knife, many of these drifters pain-stakingly altered the extremely hard copper-nickel alloy, transforming the Indian's head into profile portraits of friends and loved ones (both male and female), of other hobos, or of themselves. Rare examples also feature alterations of the "buffalo," typically into donkeys or elephants. These "Hobo Nickels" were a way for the vagabonds to increase the value of the coin so that it brought a more advantageous exchange when used to barter for food and drink, or for lodging or transportation." Via: Lord-whimsy