Clam shell used for making buttons. The earliest known button was found at Mohenjo-daro. It is made of a curved shell and is about 5000 yrs old. The first buttons were used more as an ornament than as a fastening. Bronze Age Civilization, Indus Valley Civilization, Silver Buttons, Vintage Buttons, Make Your Own Buttons, Mohenjo Daro, Types Of Buttons, Soft Corals, Shell Crafts