I lived in a house in a rural village in Oklahoma in the 1970’s that was built during the Great Depression. We had a drought and some bad wind storms one summer and I found a number of old coins around the property. Mercury head dimes that were from the 1910s, and old coins called Mills, they are round with a square hole punched in. They were used to pay one/tenth of a cent taxes in some cities and towns. The hole in the center was so they could string them together. People hated carrying a pocket full of these but could string them together to pay those taxes with. They were made from aluminum
