The Franklin Badge is an item that appears in all three titles of the Mother series. It is a unique badge famous for its reflective properties that protect its holder from specific PSI abilities, though its specific purpose and method of obtaining it differs between games. Unlike similar items, it does not need to be equipped; merely having it in a character's inventory is enough to activate it.~Earthbound Wiki

Build from the inside of the top out to the rim. Then close it off with the back piece.

High resolution version here : http://chippysmith.deviantart.com/art/Papercraft-Franklin-Badge-Design-Mother-584999783